feat(mcp-core): support Mcp-Name header for Streamable HTTP (SEP-2243) #526

Job	Run time
Client Conformance (tools_call)	38s
Client Conformance (sse-retry)	53s
Client Conformance (elicitation-sep1034-client-defaults)	45s
Client Conformance (initialize)	1m 0s
Server Conformance	58s
Auth Conformance (auth/scope-retry-limit)	55s
Auth Conformance (auth/pre-registration)	46s
Auth Conformance (auth/token-endpoint-auth-none)	44s
Auth Conformance (auth/scope-from-scopes-supported)	51s
Auth Conformance (auth/scope-omitted-when-undefined)	56s
Auth Conformance (auth/scope-from-www-authenticate)	49s
Auth Conformance (auth/token-endpoint-auth-basic)	56s
Auth Conformance (auth/scope-step-up)	59s
Auth Conformance (auth/metadata-var1)	47s
Auth Conformance (auth/metadata-var3)	46s
Auth Conformance (auth/basic-cimd)	48s
Auth Conformance (auth/token-endpoint-auth-post)	43s
Auth Conformance (auth/metadata-default)	43s
Auth Conformance (auth/metadata-var2)	44s
	15m 41s

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