Add more configuration options for JWT Auth Backend

[lawliet89]

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Relates OR Closes #0000

Release note for CHANGELOG:

-  Add `oidc_response_mode`, `oidc_response_types`, and `namespace_in_state` fields to `vault_jwt_auth_backend`

Output from acceptance testing:

$ VAULT_ADDR=http://127.0.0.1:8200 VAULT_TOKEN=12345 TESTARGS="--run TestAccJWTAuthBackend" make testacc
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test $(go list ./...) -v --run TestAccJWTAuthBackend -timeout 20m
?       github.com/hashicorp/terraform-provider-vault   [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/coverage      [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/generate      [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/codegen   (cached) [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/generated [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/decode    0.009s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/datasources/transform/encode    0.009s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/alphabet    0.009s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/role        0.009s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/template    0.010s [no tests to run]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/generated/resources/transform/transformation      0.008s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
testing: warning: no tests to run
PASS
ok      github.com/hashicorp/terraform-provider-vault/util      (cached) [no tests to run]
=== RUN   TestAccJWTAuthBackendRole_import
--- PASS: TestAccJWTAuthBackendRole_import (0.94s)
=== RUN   TestAccJWTAuthBackendRole_basic
--- PASS: TestAccJWTAuthBackendRole_basic (0.73s)
=== RUN   TestAccJWTAuthBackendRole_update
--- PASS: TestAccJWTAuthBackendRole_update (1.27s)
=== RUN   TestAccJWTAuthBackendRole_full
--- PASS: TestAccJWTAuthBackendRole_full (0.73s)
=== RUN   TestAccJWTAuthBackendRoleOIDC_full
--- PASS: TestAccJWTAuthBackendRoleOIDC_full (1.43s)
=== RUN   TestAccJWTAuthBackendRoleOIDC_disableParsing
--- PASS: TestAccJWTAuthBackendRoleOIDC_disableParsing (1.50s)
=== RUN   TestAccJWTAuthBackendRole_fullUpdate
--- PASS: TestAccJWTAuthBackendRole_fullUpdate (1.28s)
=== RUN   TestAccJWTAuthBackend
--- PASS: TestAccJWTAuthBackend (2.95s)
=== RUN   TestAccJWTAuthBackendProviderConfig
--- PASS: TestAccJWTAuthBackendProviderConfig (0.79s)
=== RUN   TestAccJWTAuthBackend_OIDC
--- PASS: TestAccJWTAuthBackend_OIDC (1.44s)
=== RUN   TestAccJWTAuthBackend_invalid
--- PASS: TestAccJWTAuthBackend_invalid (0.35s)
=== RUN   TestAccJWTAuthBackend_missingMandatory
--- PASS: TestAccJWTAuthBackend_missingMandatory (1.34s)
=== RUN   TestAccJWTAuthBackendProviderConfigConversionBool
--- PASS: TestAccJWTAuthBackendProviderConfigConversionBool (0.00s)
=== RUN   TestAccJWTAuthBackendProviderConfigConversionInt
--- PASS: TestAccJWTAuthBackendProviderConfigConversionInt (0.00s)
=== RUN   TestAccJWTAuthBackendProviderConfig_negative
    resource_jwt_auth_backend_test.go:379: true
--- SKIP: TestAccJWTAuthBackendProviderConfig_negative (0.00s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/vault     14.758s

[benashz]

A few minor suggestions to address, then 👍

[benashz]

LGTM!