feat(data_source_kv_secret_v2): add the metadata version in returned values

[Ameausoone]

Description

This PR add the field "version" in the data source : vault_kv_secret_v2, which is useful when we don't specify the version in input.

Closes #2094

Checklist

• [x] Added CHANGELOG entry (only for user-facing changes)
  • It's not directly modified the user api IMO, but I could change this.
• [x] Acceptance tests where run against all supported Vault Versions
  • I didn't modified the tests because Metadatas are not tested against this datasource.

Output from acceptance testing:

I ran tests against the modified data source.

❯ m testacc TESTARGS="-run=TestDataSourceKVV2Secret"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -run=TestDataSourceKVV2Secret -timeout 30m ./...
?       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]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/consts   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/group   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/mfa     [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/pki      [no test files]
ok      github.com/hashicorp/terraform-provider-vault/codegen   (cached) [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  (cached) [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/provider (cached) [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/testutil  (cached) [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/util      (cached) [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/vault     24.516s
❯ m testacc TESTARGS="-run=TestDataSourceKVV2Secret_deletedSecret"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -run=TestDataSourceKVV2Secret_deletedSecret -timeout 30m ./...
?       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]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/consts   [no test files]
ok      github.com/hashicorp/terraform-provider-vault/codegen   0.294s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/group   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/mfa     [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/pki      [no test files]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  0.858s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/internal/provider 0.989s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/testutil  0.625s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/util      0.649s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/vault     6.813s

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[hashicorp-cla]

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