Add StateFunc to store values in lower case

[bill-rich]

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Closes #15583

Output from acceptance testing:

TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSDBParameterGroup_ -timeout 120m
=== RUN   TestAccAWSDBParameterGroup_basic
=== PAUSE TestAccAWSDBParameterGroup_basic
=== RUN   TestAccAWSDBParameterGroup_caseWithMixedParameters
=== PAUSE TestAccAWSDBParameterGroup_caseWithMixedParameters
=== RUN   TestAccAWSDBParameterGroup_limit
=== PAUSE TestAccAWSDBParameterGroup_limit
=== RUN   TestAccAWSDBParameterGroup_Disappears
=== PAUSE TestAccAWSDBParameterGroup_Disappears
=== RUN   TestAccAWSDBParameterGroup_namePrefix
=== PAUSE TestAccAWSDBParameterGroup_namePrefix
=== RUN   TestAccAWSDBParameterGroup_generatedName
=== PAUSE TestAccAWSDBParameterGroup_generatedName
=== RUN   TestAccAWSDBParameterGroup_withApplyMethod
=== PAUSE TestAccAWSDBParameterGroup_withApplyMethod
=== RUN   TestAccAWSDBParameterGroup_Only
=== PAUSE TestAccAWSDBParameterGroup_Only
=== RUN   TestAccAWSDBParameterGroup_MatchDefault
=== PAUSE TestAccAWSDBParameterGroup_MatchDefault
=== RUN   TestAccAWSDBParameterGroup_updateParameters
=== PAUSE TestAccAWSDBParameterGroup_updateParameters
=== CONT  TestAccAWSDBParameterGroup_basic
=== CONT  TestAccAWSDBParameterGroup_withApplyMethod
=== CONT  TestAccAWSDBParameterGroup_MatchDefault
=== CONT  TestAccAWSDBParameterGroup_Only
=== CONT  TestAccAWSDBParameterGroup_caseWithMixedParameters
=== CONT  TestAccAWSDBParameterGroup_updateParameters
=== CONT  TestAccAWSDBParameterGroup_namePrefix
=== CONT  TestAccAWSDBParameterGroup_limit
=== CONT  TestAccAWSDBParameterGroup_Disappears
=== CONT  TestAccAWSDBParameterGroup_generatedName
--- PASS: TestAccAWSDBParameterGroup_Disappears (12.86s)
--- PASS: TestAccAWSDBParameterGroup_generatedName (16.50s)
--- PASS: TestAccAWSDBParameterGroup_namePrefix (20.30s)
--- PASS: TestAccAWSDBParameterGroup_Only (23.25s)
--- PASS: TestAccAWSDBParameterGroup_MatchDefault (25.28s)
--- PASS: TestAccAWSDBParameterGroup_caseWithMixedParameters (27.35s)
--- PASS: TestAccAWSDBParameterGroup_withApplyMethod (29.02s)
--- PASS: TestAccAWSDBParameterGroup_updateParameters (42.27s)
--- PASS: TestAccAWSDBParameterGroup_basic (47.21s)
--- PASS: TestAccAWSDBParameterGroup_limit (50.32s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	50.358s

[YakDriver]

Looks great! 🎉

It seems like something that should be handleable by docs but this saves people from themselves. We probably all need a bit of that!

Acceptance tests (GovCloud):

--- PASS: TestAccAWSDBParameterGroup_Disappears (17.90s)
--- PASS: TestAccAWSDBParameterGroup_generatedName (22.09s)
--- PASS: TestAccAWSDBParameterGroup_namePrefix (22.11s)
--- PASS: TestAccAWSDBParameterGroup_caseWithMixedParameters (22.44s)
--- PASS: TestAccAWSDBParameterGroup_Only (22.60s)
--- PASS: TestAccAWSDBParameterGroup_withApplyMethod (25.61s)
--- PASS: TestAccAWSDBParameterGroup_MatchDefault (29.21s)
--- PASS: TestAccAWSDBParameterGroup_updateParameters (43.58s)
--- PASS: TestAccAWSDBParameterGroup_limit (50.24s)
--- PASS: TestAccAWSDBParameterGroup_basic (62.01s)

Tests on commercial:

--- PASS: TestAccAWSDBParameterGroup_Disappears (15.04s)
--- PASS: TestAccAWSDBParameterGroup_generatedName (18.57s)
--- PASS: TestAccAWSDBParameterGroup_namePrefix (18.62s)
--- PASS: TestAccAWSDBParameterGroup_MatchDefault (21.30s)
--- PASS: TestAccAWSDBParameterGroup_Only (22.51s)
--- PASS: TestAccAWSDBParameterGroup_withApplyMethod (23.82s)
--- PASS: TestAccAWSDBParameterGroup_caseWithMixedParameters (31.54s)
--- PASS: TestAccAWSDBParameterGroup_limit (45.56s)
--- PASS: TestAccAWSDBParameterGroup_updateParameters (47.52s)
--- PASS: TestAccAWSDBParameterGroup_basic (57.63s)

[ghost]

This has been released in version 3.33.0 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 for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!