database_uri: add URI parameters as attributes

[kobajagi]

Description

Adds URI parameters as individual attributes to make it easier to use.

New attributes are: schema, host, port, username, password & db_name.
Attributes can be nil as not all database services support all the attributes.

Closes #279 and #382

Checklist

(For exoscale contributors)

• Changelog updated (under Unreleased block)
• Acceptance tests OK
• For a new resource, datasource or new attributes: acceptance test added/updated

Testing

$ TF_ACC=1 go test ./... -run TestDatabase/DataSourceURI 
?       github.com/exoscale/terraform-provider-exoscale [no test files]
?       github.com/exoscale/terraform-provider-exoscale/pkg/config      [no test files]
?       github.com/exoscale/terraform-provider-exoscale/pkg/general     [no test files]
ok      github.com/exoscale/terraform-provider-exoscale/exoscale        0.011s [no tests to run]
ok      github.com/exoscale/terraform-provider-exoscale/pkg/filter      0.003s [no tests to run]
?       github.com/exoscale/terraform-provider-exoscale/pkg/provider    [no test files]
?       github.com/exoscale/terraform-provider-exoscale/pkg/provider/config     [no test files]
ok      github.com/exoscale/terraform-provider-exoscale/pkg/list        0.019s [no tests to run]
ok      github.com/exoscale/terraform-provider-exoscale/pkg/resources/anti_affinity_group       0.011s [no tests to run]
ok      github.com/exoscale/terraform-provider-exoscale/pkg/resources/block_storage     0.010s [no tests to run]
?       github.com/exoscale/terraform-provider-exoscale/pkg/resources/zones     [no test files]
?       github.com/exoscale/terraform-provider-exoscale/pkg/testutils   [no test files]
?       github.com/exoscale/terraform-provider-exoscale/pkg/validators  [no test files]
?       github.com/exoscale/terraform-provider-exoscale/pkg/version     [no test files]
?       github.com/exoscale/terraform-provider-exoscale/pkg/utils       [no test files]
?       github.com/exoscale/terraform-provider-exoscale/version [no test files]
ok      github.com/exoscale/terraform-provider-exoscale/pkg/resources/database  53.592s
ok      github.com/exoscale/terraform-provider-exoscale/pkg/resources/iam       0.013s [no tests to run]
ok      github.com/exoscale/terraform-provider-exoscale/pkg/resources/instance  0.013s [no tests to run]
ok      github.com/exoscale/terraform-provider-exoscale/pkg/resources/instance_pool     0.011s [no tests to run]
ok      github.com/exoscale/terraform-provider-exoscale/pkg/resources/nlb_service       0.011s [no tests to run]

Kafka

$ terraform state show data.exoscale_database_uri.my_database
# data.exoscale_database_uri.my_database:
data "exoscale_database_uri" "my_database" {
    host = "mydb-exoscale-9f21ec06-ab34-44e1-a8de-1714e4120c91.d.aivencloud.com"
    id   = "mydb"
    name = "mydb"
    port = 21701
    type = "kafka"
    uri  = (sensitive value)
    zone = "ch-gva-2"
}

MySQL

$ terraform state show data.exoscale_database_uri.my_database
# data.exoscale_database_uri.my_database:
data "exoscale_database_uri" "my_database" {
    db_name  = "defaultdb"
    host     = "mydb-exoscale-9f21ec06-ab34-44e1-a8de-1714e4120c91.d.aivencloud.com"
    id       = "mydb"
    name     = "mydb"
    password = (sensitive value)
    port     = 21699
    schema   = "mysql"
    type     = "mysql"
    uri      = (sensitive value)
    username = "avnadmin"
    zone     = "ch-gva-2"
}

Pg

$ terraform state show data.exoscale_database_uri.my_database
# data.exoscale_database_uri.my_database:
data "exoscale_database_uri" "my_database" {
    db_name  = "defaultdb"
    host     = "mydb-exoscale-9f21ec06-ab34-44e1-a8de-1714e4120c91.d.aivencloud.com"
    id       = "mydb"
    name     = "mydb"
    password = (sensitive value)
    port     = 21699
    schema   = "postgres"
    type     = "pg"
    uri      = (sensitive value)
    username = "avnadmin"
    zone     = "ch-gva-2"
}

Redis

$ terraform state show data.exoscale_database_uri.my_database
# data.exoscale_database_uri.my_database:
data "exoscale_database_uri" "my_database" {
    host     = "mydb-exoscale-9f21ec06-ab34-44e1-a8de-1714e4120c91.d.aivencloud.com"
    id       = "mydb"
    name     = "mydb"
    password = (sensitive value)
    port     = 21700
    schema   = "rediss"
    type     = "redis"
    uri      = (sensitive value)
    username = "default"
    zone     = "ch-gva-2"
}

OpenSearch

$ terraform state show data.exoscale_database_uri.my_database
# data.exoscale_database_uri.my_database:
data "exoscale_database_uri" "my_database" {
    host     = "mydb-exoscale-9f21ec06-ab34-44e1-a8de-1714e4120c91.d.aivencloud.com"
    id       = "mydb"
    name     = "mydb"
    password = (sensitive value)
    port     = 21699
    schema   = "https"
    type     = "opensearch"
    uri      = (sensitive value)
    username = "avnadmin"
    zone     = "ch-gva-2"
}

Grafana

$ terraform state show data.exoscale_database_uri.my_database
# data.exoscale_database_uri.my_database:
data "exoscale_database_uri" "my_database" {
    host     = "mydb-exoscale-9f21ec06-ab34-44e1-a8de-1714e4120c91.d.aivencloud.com"
    id       = "mydb"
    name     = "mydb"
    password = (sensitive value)
    port     = 443
    schema   = "https"
    type     = "grafana"
    uri      = (sensitive value)
    username = "avnadmin"
    zone     = "ch-gva-2"
}

[PhilippeChepy]

LGTM
(modulo acceptance tests)