feat: manual resolver and example

[rajatagarwal-ibm]

Description

• Option to create a manual resolver
• Added validations and flags
• Example
• Tests

fixes #652

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[rajatagarwal-ibm]

@vburckhardt FYI

when I try to spin up "delegated" service - it says only system and manual are allowed. See the message below:

│         "errors": [
│             {
│                 "code": "validation_failed_oneof",
│                 "message": "Expected only one oneOf fields to be set: got 0",
│                 "target": {
│                     "name": "VpcdnsResolverPrototype",
│                     "type": "field"
│                 }
│             },
│             {
│                 "code": "validation_failed_enum",
│                 "message": "VpcdnsResolverTypeManualPrototype is invalid: Validation Failure: Expected [\"manual\"]",
│                 "target": {
│                     "name": "VpcdnsResolverTypeManualPrototype.VpcdnsResolverTypeManualPrototypeType",
│                     "type": "field",
│                     "value": "\"delegated\""
│                 }
│             },
│             {
│                 "code": "validation_failed_enum",
│                 "message": "VpcdnsResolverTypeSystemPrototype is invalid: Validation Failure: Expected [\"system\"]",
│                 "target": {
│                     "name": "VpcdnsResolverTypeSystemPrototype.VpcdnsResolverTypeSystemPrototypeType",
│                     "type": "field",
│                     "value": "\"delegated\""
│                 }
│             }
│         ],
│         "trace": "ee4a6b58-4f91-4274-a3cf-1c23baa37a11"
│     }
│ }
│  
│ 
│   with module.spoke_vpc.ibm_is_vpc.vpc,
│   on ../../main.tf line 29, in resource "ibm_is_vpc" "vpc":
│   29: resource "ibm_is_vpc" "vpc" {
│ 
╵

It also says that "dns" is invitation-only service. Not sure if that might be the reason behind not supporting "delegated" service yet (docs: https://registry.terraform.io/providers/IBM-Cloud/ibm/latest/docs/resources/is_vpc#dns)

[rajatagarwal-ibm]

Ran both pr_tests and other_tests locally and they passed successfully.

[vburckhardt]

/run pipeline

[vburckhardt]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 7.10.0 🎉

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