Support server-sent events in JsonRpcService

[ikhoon]

Motivation:

We can easily implement other protocols such as MCP on top of JsonRpcService by adding SSE support.

Modifications:

• Reorganized JSON-RPC message data types so that JsonRpcHandler can handle JsonRpcResponse and JsonRpcNotifcation.
  • Introduced JsonRpcMessage as the root interface of JSON-RPC messages.
• JsonRpcStreamableResponse is newly added to allow writing multiple JSON-RPC messages before emitting a final response.
  • The streamable response is converted to SSE by JsonRpcService.
• JsonRpcExceptionHandler is added to recover an exception into a JsonRpcResponse.
• Renamed JsonRpcHandler into JsonRpcMehtodHandler and the orignal interface is used as a global handler to process any JSON-RPC messages.
• JsonRpcStatusFunction maps a JsonRpcError into an HTTP status.
• Because testing non-OK JSON responses was difficult, a predicate-based HTTP status check was added to the WebClient.prepare().asJson() API.

Result:

• Several handlers have been added to customize the behavior of JsonRpcService.
• You can now stream JSON-RPC messages over server-sent events.

Future work:

• Extract the JSON-RPC code into armeria-jsonrpc module.

[ikhoon]

Renamed from JsonRpcParameter

[github-actions]

🔍 Build Scan® (commit: b89420f)

Job name	Status	Build Scan®
build-ubicloud-standard-16-jdk-8	✅	https://ge.armeria.dev/s/eiqg4fyhjudbo
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/nhu4dakxz25og
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/2arvcvr2ncgbu
build-ubicloud-standard-16-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/gyofozfjolsqi
build-ubicloud-standard-16-jdk-17-leak	✅	https://ge.armeria.dev/s/dsxhklf4giwoi
build-ubicloud-standard-16-jdk-11	✅	https://ge.armeria.dev/s/3gt72vzws5n5s
build-macos-latest-jdk-21	✅	https://ge.armeria.dev/s/6ibm5o22g63vo

[codecov]

Codecov Report

❌ Patch coverage is 73.83367% with 129 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (json-rpc@3ce41df). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...corp/armeria/common/jsonrpc/JsonRpcParameters.java	55.73%	17 Missing and 10 partials ⚠️
...inecorp/armeria/server/jsonrpc/JsonRpcService.java	85.07%	7 Missing and 13 partials ⚠️
...armeria/common/jsonrpc/DefaultJsonRpcResponse.java	69.23%	4 Missing and 8 partials ⚠️
...eria/common/jsonrpc/JsonRpcStreamableResponse.java	27.27%	7 Missing and 1 partial ⚠️
...ria/common/jsonrpc/DefaultJsonRpcNotification.java	56.25%	2 Missing and 5 partials ⚠️
...server/jsonrpc/DefaultJsonRpcExceptionHandler.java	41.66%	5 Missing and 2 partials ⚠️
...mmon/jsonrpc/DefaultJsonRpcStreamableResponse.java	73.91%	3 Missing and 3 partials ⚠️
...ria/internal/common/jsonrpc/JsonRpcSseMessage.java	71.42%	2 Missing and 4 partials ⚠️
...ia/client/BlockingWebClientRequestPreparation.java	54.54%	5 Missing ⚠️
...armeria/common/jsonrpc/AbstractJsonRpcRequest.java	70.58%	2 Missing and 3 partials ⚠️
... and 8 more

Additional details and impacted files

@@             Coverage Diff             @@
##             json-rpc    #6487   +/-   ##
===========================================
  Coverage            ?   74.17%           
  Complexity          ?    23221           
===========================================
  Files               ?     2087           
  Lines               ?    86775           
  Branches            ?    11392           
===========================================
  Hits                ?    64363           
  Misses              ?    16966           
  Partials            ?     5446           

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