add changelogs

.changes/unreleased/ENHANCEMENTS-20240503-161709.yaml

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+kind: ENHANCEMENTS
+body: 'helper/resource: Added `(TestCase).AdditionalCLIOptions` with `AllowDeferral`
+  option for plan and apply commands.'
+time: 2024-05-03T16:17:09.64792-04:00
+custom:
+  Issue: "331"

.changes/unreleased/FEATURES-20240503-161531.yaml

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+kind: FEATURES
+body: 'plancheck: Added  `ExpectDeferredChange` and `ExpectNoDeferredChanges` checks
+  for experimental deferred action support.'
+time: 2024-05-03T16:15:31.03438-04:00
+custom:
+  Issue: "331"

.changes/unreleased/FEATURES-20240503-161802.yaml

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+kind: FEATURES
+body: 'tfversion: Added `SkipIfNotPrerelease` version check for testing experimental
+  features of prerelease Terraform builds.'
+time: 2024-05-03T16:18:02.132794-04:00
+custom:
+  Issue: "331"