Add runtime validation for plugin props using Zod

[Harishvishwa01]

Currently, the withTwilioVideoWebrtc config plugin does not validate the props passed to it at runtime. This may lead to unexpected build-time errors if invalid values are provided.

I propose adding Zod-based schema validation to:
path : plugin/src/index.ts
Ensure cameraPermission and microphonePermission are valid strings

Provide meaningful error messages for invalid inputs

Optionally support default permission values

This would improve:

Developer experience

Plugin reliability

Type safety beyond TypeScript (runtime validation)

I can submit a PR implementing this enhancement.