feat(plugins): let a command ask the user with a picker, an input box or a confirmation (#1779)

Plugin API 1.2 adds `ui.pick`, `ui.pick-many`, `ui.input`, `ui.confirm` and `views.reveal`. The dialogs show in the window whose command or event asked and block that call until the user answers; the wait is added to the call's deadline, so it doesn't use up the time budget. They need no capability and return `invalid` without a window (events without a client, rendering, editor providers). Prompts are withdrawn when the call is cancelled or the plugin stops, and reach remote windows through the dispatcher (`plugin_answer_prompt`). `views.reveal` brings one of the plugin's declared views to the front. The Rust SDK and its mock gain `pick`, `pick_many`, `input`, `confirm` and `reveal_view`. All components are rebuilt for the WIT change.

Closes #1768

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

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

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+d2b50d6ee2fe2a0991b7a0006c4899930cfb884f32db231f99c3144ef7f7d0d0