feat(codewhisperer): add release notes

Author: leigaol

.changes/next-release/Feature-31c80933-d23c-4d02-9302-7a796f03e2cf.json

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+{
+	"type": "Feature",
+	"description": "Amazon CodeWhisperer now adds new access methods with AWS Builder ID and AWS IAM Identity Center to enable and get started. "
+}

.changes/next-release/Feature-89e2c6da-e030-466c-86b6-ade619399a49.json

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+{
+	"type": "Feature",
+	"description": "Amazon CodeWhisperer recommendations are more context aware. We are removing the overlaps from CodeWhisperer suggestions specifically when the cursor is inside a code block."
+}

.changes/next-release/Feature-b3a38063-19a1-4875-ba69-0bc418753323.json

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+{
+	"type": "Feature",
+	"description": "Amazon CodeWhisperer now supports TypeScript and C# programming languages."
+}

.changes/next-release/Feature-c9219099-a568-4f49-a907-95922197dc05.json

@@ -0,0 +1,4 @@
+{
+	"type": "Feature",
+	"description": "Amazon CodeWhisperer is now available as a supported feature and no longer an experimental feature."
+}

.changes/next-release/Feature-f6f3cb66-e972-4430-aade-3c641d60148f.json

@@ -0,0 +1,4 @@
+{
+	"type": "Feature",
+	"description": "Amazon CodeWhisperer now supports JavaScript for Security Scan to catch security vulnerabilities."
+}