Add replication subnet group datasource to dms

[nam054]

Description

Adding replication_subnet_group datasource to dms resource

Relations

Relates #12713

References

Output from Acceptance Testing

> make testacc TESTARGS='-run=TestAccDMSReplicationSubnetGroupDataSource_basic' PKG=dms
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/dms/... -v -count 1 -parallel 20  -run=TestAccDMSReplicationSubnetGroupDataSource_basic -timeout 180m
=== RUN   TestAccDMSReplicationSubnetGroupDataSource_basic
=== PAUSE TestAccDMSReplicationSubnetGroupDataSource_basic
=== CONT  TestAccDMSReplicationSubnetGroupDataSource_basic
--- PASS: TestAccDMSReplicationSubnetGroupDataSource_basic (17.05s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/dms        23.625s

...

[github-actions]

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[johnsonaj]

LGTM 🚀 . Just one suggestion in the comments

$ make testacc TESTARGS='-run=TestAccDMSReplicationSubnetGroupDataSource_basic' PKG=dms

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/dms/... -v -count 1 -parallel 20  -run=TestAccDMSReplicationSubnetGroupDataSource_basic -timeout 180m
--- PASS: TestAccDMSReplicationSubnetGroupDataSource_basic (20.32s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/dms	23.534s

[github-actions]

This functionality has been released in v4.65.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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