[AND-22] Expose Transcription APIs to Call Class

[rahul-lohra]

🎯 Goal

We want to expose transcriptions related apis

• startTranscription: Initiates the transcription process.
• stopTranscription: Terminates the ongoing transcription process.
• listTranscription: Retrieves a list of available transcriptions.

These APIs are now accessible to enable seamless integration of transcription features within the Call class.

🛠 Implementation details

These apis are exposed via StreamVideoImpl and it uses ProductvideoApi to perform REST API calls

🎨 UI Changes

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🧪 Testing

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☑️Contributor Checklist

General

• I have signed the Stream CLA (required)
• Assigned a person / code owner group (required)
• Thread with the PR link started in a respective Slack channel (required internally)
• PR targets the develop branch
• PR is linked to the GitHub issue it resolves

Code & documentation

• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (KDocs, docusaurus, tutorial)
• Tutorial starter kit updated
• Examples/guides starter kits updated (stream-video-examples)

☑️Reviewer Checklist

• XML sample runs & works
• Compose sample runs & works
• Tutorial starter kit
• Example starter kits work
• UI Changes correct (before & after images)
• Bugs validated (bugfixes)
• New feature tested and works
• Release notes and docs clearly describe changes
• All code we touched has new or updated KDocs

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