feat: update src/call_templates

[Raezil]

Summary by cubic

Added handlers and registration for 10 new call template types: websocket, grpc, graphql, tcp, udp, sse, mcp, webrtc, http_stream, and text. This expands provider support across streaming, network, and RPC protocols.

• New Features
  • Normalized key fields per template (e.g., url, headers, host/port, operation_type, timeout_ms, signaling_server).
  • Added unit tests for websocket, grpc, and mcp to validate provider_type and field mapping.

^{Written for commit 9bb53bd. Summary will update automatically on new commits.}

[cubic-dev-ai]

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