feat(plugins): tidy the unreleased 1.3 API before it freezes (#2079)

- workspace.symbols becomes the project method project.symbols(query, limit), like find-files; the Rust SDK's Project::symbols is unchanged, components built against the previous main need a rebuild.
- The open-log-tab web message names its arguments args, as pty-spawn and the services process-log do; baseArgs is refused with log-error rather than ignored.
- Document the hover, semantic-tokens and diagnostics provider exports and their worlds.

plugins/official/string-tools/dist/plugin.wasm.sources

@@ -1 +1 @@
-5c96088e3f31ee74669bb4481fee6c95f51a9d875ad9bed9123f3e0de1a6ead5
+548c6ed16fcd5d3a053bf6d8417d52ebd0fd74138d0665e9205eb8bf32ec497a