r/db_parameter_group: Allow mixed case parameter values

[YakDriver]

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Closes #18815
Closes #18035
Closes #14970

Output from acceptance testing (commercial):

--- PASS: TestAccAWSDBClusterParameterGroup_disappears (24.57s)
--- PASS: TestAccAWSDBClusterParameterGroup_namePrefix_Parameter (30.10s)
--- PASS: TestAccAWSDBClusterParameterGroup_generatedName (34.03s)
--- PASS: TestAccAWSDBClusterParameterGroup_generatedName_Parameter (35.44s)
--- PASS: TestAccAWSDBParameterGroup_generatedName (39.03s)
--- PASS: TestAccAWSDBParameterGroup_namePrefix (39.24s)
--- PASS: TestAccAWSDBClusterParameterGroup_only (43.86s)
--- PASS: TestAccAWSDBParameterGroup_MatchDefault (61.00s)
--- PASS: TestAccAWSDBParameterGroup_withApplyMethod (65.69s)
--- PASS: TestAccAWSDBParameterGroup_caseWithMixedParameters (41.65s)
--- PASS: TestAccAWSDBClusterParameterGroup_updateParameters (69.36s)
--- PASS: TestAccAWSDBParameterGroup_caseParameters (75.95s)
--- PASS: TestAccAWSDBClusterParameterGroup_namePrefix (86.63s)
--- PASS: TestAccAWSDBClusterParameterGroup_basic (89.44s)
--- PASS: TestAccAWSDBParameterGroup_Only (89.52s)
--- PASS: TestAccAWSDBParameterGroup_updateParameters (92.44s)
--- PASS: TestAccAWSDBParameterGroup_limit (100.61s)
--- PASS: TestAccAWSDBParameterGroup_basic (106.13s)
--- PASS: TestAccAWSDBClusterParameterGroup_withApplyMethod (131.37s)
--- PASS: TestAccAWSDBParameterGroup_Disappears (137.29s)
--- PASS: TestAccAWSDBClusterParameterGroup_caseParameters (150.17s)

GovCloud testing:

--- PASS: TestAccAWSDBParameterGroup_Only (24.39s)
--- PASS: TestAccAWSDBClusterParameterGroup_namePrefix (36.61s)
--- PASS: TestAccAWSDBClusterParameterGroup_disappears (43.71s)
--- PASS: TestAccAWSDBClusterParameterGroup_generatedName (52.04s)
--- PASS: TestAccAWSDBClusterParameterGroup_caseParameters (52.81s)
--- PASS: TestAccAWSDBClusterParameterGroup_namePrefix_Parameter (58.08s)
--- PASS: TestAccAWSDBParameterGroup_withApplyMethod (61.52s)
--- PASS: TestAccAWSDBParameterGroup_generatedName (62.22s)
--- PASS: TestAccAWSDBParameterGroup_caseWithMixedParameters (64.79s)
--- PASS: TestAccAWSDBClusterParameterGroup_generatedName_Parameter (68.31s)
--- PASS: TestAccAWSDBParameterGroup_Disappears (69.34s)
--- PASS: TestAccAWSDBClusterParameterGroup_updateParameters (72.36s)
--- PASS: TestAccAWSDBClusterParameterGroup_only (74.65s)
--- PASS: TestAccAWSDBParameterGroup_namePrefix (51.50s)
--- PASS: TestAccAWSDBParameterGroup_MatchDefault (80.03s)
--- PASS: TestAccAWSDBParameterGroup_caseParameters (85.01s)
--- PASS: TestAccAWSDBParameterGroup_limit (90.26s)
--- PASS: TestAccAWSDBParameterGroup_basic (92.20s)
--- PASS: TestAccAWSDBClusterParameterGroup_basic (98.36s)
--- PASS: TestAccAWSDBClusterParameterGroup_withApplyMethod (111.28s)
--- PASS: TestAccAWSDBParameterGroup_updateParameters (116.00s)

[ewbankkit]

As parameter.name is now stored in state as lowercase, do you want to add a test with an upper (or mixed) case parameter name?
There's no risk of existing configurations that had the parameter.value persisted in state as lowercase and parameter.name in original case now showing a diff, correct?

[YakDriver]

Acceptance tests on GovCloud:

--- PASS: TestAccAWSDBParameterGroup_Disappears (18.94s)
--- PASS: TestAccAWSDBParameterGroup_generatedName (23.01s)
--- PASS: TestAccAWSDBParameterGroup_namePrefix (23.13s)
--- PASS: TestAccAWSDBParameterGroup_withApplyMethod (27.10s)
--- PASS: TestAccAWSDBParameterGroup_caseWithMixedParameters (35.29s)
--- PASS: TestAccAWSDBParameterGroup_Only (37.17s)
--- PASS: TestAccAWSDBParameterGroup_MatchDefault (38.01s)
--- PASS: TestAccAWSDBParameterGroup_caseParameters (44.69s)
--- PASS: TestAccAWSDBParameterGroup_updateParameters (52.25s)
--- PASS: TestAccAWSDBParameterGroup_limit (60.44s)
--- PASS: TestAccAWSDBParameterGroup_basic (66.52s)

Acceptance tests on us-west-2:

--- PASS: TestAccAWSDBParameterGroup_Disappears (15.79s)
--- PASS: TestAccAWSDBParameterGroup_namePrefix (21.92s)
--- PASS: TestAccAWSDBParameterGroup_withApplyMethod (24.27s)
--- PASS: TestAccAWSDBParameterGroup_generatedName (25.82s)
--- PASS: TestAccAWSDBParameterGroup_MatchDefault (26.50s)
--- PASS: TestAccAWSDBParameterGroup_Only (28.42s)
--- PASS: TestAccAWSDBParameterGroup_caseWithMixedParameters (37.80s)
--- PASS: TestAccAWSDBParameterGroup_caseParameters (39.85s)
--- PASS: TestAccAWSDBParameterGroup_updateParameters (49.48s)
--- PASS: TestAccAWSDBParameterGroup_limit (59.64s)
--- PASS: TestAccAWSDBParameterGroup_basic (61.86s)

[github-actions]

This functionality has been released in v3.55.0 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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