[Calls] Added changelog file and entries

src/content/changelogs/calls.yaml

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+---
+link: "/calls/changelog/"
+productName: Calls
+productLink: "/calls/"
+productArea: Developer platform
+productAreaLink: /workers/platform/changelog/platform/
+entries:
+  - publish_date: "2024-09-25"
+    title: TURN service is generally available (GA)
+    description: |-
+      Cloudflare Calls TURN service is generally available and helps address common challenges with real-time communication. For more information, refer to the [blog post](https://blog.cloudflare.com/webrtc-turn-using-anycast/) or [TURN documentation](/calls/turn/).
+  - publish_date: "2024-04-04"
+    title: Orange Meets availability
+    description: |-
+      Orange Meets, Cloudflare's internal video conferencing app, is open source and available for use from [Github](https://github.com/cloudflare/orange?cf_target_id=40DF7321015C5928F9359DD01303E8C2). 
+  - publish_date: "2024-04-04"
+    title: Cloudflare Calls open beta
+    description: |-
+      Cloudflare Calls is in open beta and available from the Cloudflare Dashboard.
+  - publish_date: "2022-09-27"
+    title: Cloudflare Calls closed beta
+    description: |-
+      Cloudflare Calls is available as a closed beta for users who request an invitation. Refer to the [blog post](https://blog.cloudflare.com/announcing-cloudflare-calls/) for more information.

src/content/docs/calls/changelog.mdx

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+---
+pcx_content_type: changelog
+title: Changelog
+changelog_file_name:
+  - calls
+---
+
+import { ProductChangelog } from "~/components";
+
+{/* <!-- Actual content lives in /src/content/changelogs/calls.yaml. --> */}
+
+<ProductChangelog />