Adding new data source aws_db_option_group

[Skoczek135]

Description

Creates new data source - aws_db_option_group

Relations

Closes #41729

References

https://docs.aws.amazon.com/cli/latest/reference/rds/describe-option-groups.html

Output from Acceptance Testing

% make testacc TESTS=TestAccRDSOptionGroupDataSource_basic PKG=rds                                                                         
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.5 test ./internal/service/rds/... -v -count 1 -parallel 20 -run='TestAccRDSOptionGroupDataSource_basic'  -timeout 360m -vet=off
2025/04/04 09:28:03 Initializing Terraform AWS Provider...
=== RUN   TestAccRDSOptionGroupDataSource_basic
=== PAUSE TestAccRDSOptionGroupDataSource_basic
=== CONT  TestAccRDSOptionGroupDataSource_basic
--- PASS: TestAccRDSOptionGroupDataSource_basic (22.91s)
PASS
ok      [github.com/hashicorp/terraform-provider-aws/internal/service/rds](http://github.com/hashicorp/terraform-provider-aws/internal/service/rds)        23.083s

[github-actions]

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