feat(plugins): let a command read every file selected in the Project view (#1744)

Plugin API 1.2 adds `invocation.selected-paths`: the files and folders a Project view or editor tab menu ran the command on, as absolute paths (the command's argument stays the first of them, so existing plugins see no change). The frontend passes the menu's selection to `plugin_run_command` on the desktop and through the remote dispatcher; the Rust SDK and its mock gain `Invocation::selected_paths`. All components are rebuilt for the WIT change.

Closes #1621

Co-authored-by: arnaud-ritti <[email protected]>

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

@@ -1 +1 @@
-4fff5b261e8255aa2dac8342694dee129ea4a8c9520105c719d0c16a16846517
+adf2ab3e93e0147350b6db899ec2e44e07862e99f49609aecbc2b866e5282c3d