feat(plugins): plugin API 1.4 (#2207)

Plugin API 1.4: grants for unencrypted HTTP, local sockets, IDE commands and owned database sources; window status items, output channels, content tabs, editor selections, decorations, search, Problems and VCS reads; runs, keyed terminals with exit events, plugin run targets, dynamic run configurations and test parsers; language features, injections, snippets and menu locations; plugin MCP tools on the built-in server; four official API examples. Released 1.3 plugins keep working.

wit/commit.wit

@@ -1,4 +1,4 @@
-package openidea:plugin@1.3.0;
+package openidea:plugin@1.4.0;
 
 /// The commit being prepared in the window the current command or event came
 /// from (the Commit tool window, or the Commit dialog while it is open): the