fix: reject batch requests in streamable HTTP transport - #957
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MCP has removed support for JSON-RPC batches: a POST body must be a single JSON-RPC message. The streamable HTTP server currently decodes a
JsonArraybody into aList<JSONRPCMessage>and replies with an array response.This change rejects batch request bodies with
400 Bad Request(JSON-RPC error code-32600), mirroring the handling of other invalid payloads, and replaces the batch-specific tests with one asserting the rejection.