feat: Add SEP-973 icons and metadata support (#912) #430

Job	Run time
Client Conformance (initialize)	36s
Client Conformance (sse-retry)	54s
Client Conformance (tools_call)	46s
Client Conformance (elicitation-sep1034-client-defaults)	45s
Server Conformance	53s
Auth Conformance (auth/scope-from-www-authenticate)	42s
Auth Conformance (auth/pre-registration)	50s
Auth Conformance (auth/metadata-var2)	43s
Auth Conformance (auth/token-endpoint-auth-basic)	49s
Auth Conformance (auth/scope-from-scopes-supported)	45s
Auth Conformance (auth/scope-step-up)	49s
Auth Conformance (auth/metadata-default)	49s
Auth Conformance (auth/basic-cimd)	45s
Auth Conformance (auth/token-endpoint-auth-post)	41s
Auth Conformance (auth/scope-retry-limit)	1m 0s
Auth Conformance (auth/scope-omitted-when-undefined)	43s
Auth Conformance (auth/token-endpoint-auth-none)	56s
Auth Conformance (auth/metadata-var1)	40s
Auth Conformance (auth/metadata-var3)	45s
	14m 51s

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