Prep changelogs for v1.15.0 release (#1138)

* move go module update note

* add changelogs

* add more

* change enhancement to feature

Author: austinvalle

.changes/unreleased/ENHANCEMENTS-20250512-163846.yaml

@@ -0,0 +1,5 @@
+kind: ENHANCEMENTS
+body: 'resource: Updated `Create`, `Update`, `Read`, and `Delete` request and response objects to support the passing of identity data.'
+time: 2025-05-12T16:38:46.963101-04:00
+custom:
+    Issue: "1112"

.changes/unreleased/ENHANCEMENTS-20250512-164027.yaml

@@ -0,0 +1,5 @@
+kind: ENHANCEMENTS
+body: 'resource: Updated `ImportState` method to allow importing by resource identity and returning identity data from import response.'
+time: 2025-05-12T16:40:27.088128-04:00
+custom:
+    Issue: "1126"

.changes/unreleased/FEATURES-20250512-163215.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'tfsdk: Added `ResourceIdentity` struct to represent managed resource identity data.'
+time: 2025-05-12T16:32:15.682993-04:00
+custom:
+    Issue: "1112"

.changes/unreleased/FEATURES-20250512-163516.yaml

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+kind: FEATURES
+body: 'resource/identityschema: New package for implementing managed resource identity schemas.'
+time: 2025-05-12T16:35:16.722291-04:00
+custom:
+    Issue: "1107"

.changes/unreleased/FEATURES-20250512-164133.yaml

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+kind: FEATURES
+body: 'resource: Added new `ImportStatePassthroughWithIdentity` helper that can support both identity and ID importing via a single field.'
+time: 2025-05-12T16:41:33.806834-04:00
+custom:
+    Issue: "1134"

.changes/unreleased/FEATURES-20250512-170510.yaml

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+kind: FEATURES
+body: 'resource: Added `ResourceWithIdentity` interface for implementing managed resource identity.'
+time: 2025-05-12T17:05:10.02242-04:00
+custom:
+    Issue: "1107"

.changes/unreleased/upcoming-stable/NOTES-20250317-153311.yaml renamed to .changes/unreleased/NOTES-20250317-153311.yaml

@@ -0,0 +1,11 @@
+kind: NOTES
+body: 'all: This release contains a new interface and package for implmenting managed resource identity.
+  Resource identity is data that is defined by a separate schema and is stored alongside resource state.
+  Identity data is used by Terrform to uniquely identify a remote object and is meant to be immutable during
+  the remote object''s lifecycle. Resources that support identity can now be imported using the `identity` attribute
+  in Terraform configuration `import` blocks, available in Terraform v1.12+. The `resource.ResourceWithIdentity` interface
+  can be implemented to support identity by defining an identity schema. Once the identity schema is defined, you can read
+  and store identity data in the state file via the new `Identity` fields in the response objects on the resource CRUD methods.'
+time: 2025-05-12T16:44:41.300908-04:00
+custom:
+    Issue: "1112"