Debugger: add log.channels.list/log.channel.set over the WebSocket API

Lets a client query all log categories (Common/Log.h's Log enum) with their
current level/enabled state, and change a channel's level and/or enabled
state at runtime - same data LogConfigScreen already exposes in the UI, now
reachable from the debugger protocol. Levels are named strings (notice,
error, warning, info, debug, verbose) rather than the 1-6 numbers the
existing passive 'log' event uses (LogBroadcaster.cpp, left unchanged) -
clearer for a config-style API where you're not scanning a stream.

Registered as a new subscriber alongside the others in WebSocket.cpp, and
wired into all the build systems that need a new source file (CMake, the
Windows and UWP vcxprojs, Android.mk - libretro's Makefile.common doesn't
build any WebSocket debugger files so needs no entry).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01GZq8ZtJmFY7bkX5FVkr3P9

Core/Debugger/WebSocket.cpp

@@ -63,6 +63,7 @@
 #include "Core/Debugger/WebSocket/GPUStatsSubscriber.h"
 #include "Core/Debugger/WebSocket/HLESubscriber.h"
 #include "Core/Debugger/WebSocket/InputSubscriber.h"
+#include "Core/Debugger/WebSocket/LogConfigSubscriber.h"
 #include "Core/Debugger/WebSocket/MemoryInfoSubscriber.h"
 #include "Core/Debugger/WebSocket/MemorySubscriber.h"
 #include "Core/Debugger/WebSocket/ReplaySubscriber.h"
@@ -81,6 +82,7 @@ static const std::vector<SubscriberInit> subscribers({
 	&WebSocketGPUStatsInit,
 	&WebSocketHLEInit,
 	&WebSocketInputInit,
+	&WebSocketLogConfigInit,
 	&WebSocketMemoryInfoInit,
 	&WebSocketMemoryInit,
 	&WebSocketReplayInit,