Add aws_opensearchserverless_collection resource

[mattburgess]

Description

Adds aws_opensearchserverless_collection resource

Relations

Closes #28462

References

Output from Acceptance Testing

$ make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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[johnsonaj]

LGTM 🚀

$ make testacc TESTS=TestAccOpenSearchServerlessCollection_ PKG=opensearchserverless

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/opensearchserverless/... -v -count 1 -parallel 20 -run='TestAccOpenSearchServerlessCollection_'  -timeout 180m
--- PASS: TestAccOpenSearchServerlessCollection_basic (712.95s)
--- PASS: TestAccOpenSearchServerlessCollection_disappears (719.55s)
--- PASS: TestAccOpenSearchServerlessCollection_update (722.68s)
--- PASS: TestAccOpenSearchServerlessCollection_tags (739.37s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/opensearchserverless	742.656s

[johnsonaj]

@mattburgess thanks for the contribution! 🎉

[github-actions]

This functionality has been released in v5.4.0 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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