implementing different a2a transport

[koushiv777]

Implementing the support to set the A2A transport type when adding the A2A agent url.

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Note

Introduces configurable transport selection across A2A delegation.

• Adds transport_protocol: Literal['JSONRPC', 'GRPC', 'HTTP+JSON'] to A2AConfig (default JSONRPC)
• Threads transport_protocol through execute_a2a_delegation, aexecute_a2a_delegation, and internal _aexecute_a2a_delegation_impl
• Updates client setup to pass supported_transports=[transport_protocol] in _create_a2a_client
• Updates A2A wrapper to forward agent_config.transport_protocol in both sync and async paths
• Documents the new transport_protocol option in docs/en/learn/a2a-agent-delegation.mdx

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[lorenzejay]

only thing is more examples with a2a docs with this, but not a blocker for now