feat(plugins): read-only form fields and table row interactions (#2013)

API 1.3 through the released `other` extension cases, no WIT change: form fields `label` (plain value) and `readonly-text` (selectable, optionally multi-line, drawn as read-only), and table view-events `table-select` / `table-activate` (click, Space; double-click, Enter) with absolute row indices. Table rows also get the view's `viewItem.context` commands, keyed by row. SDK: `FieldValue::label`, `FieldValue::readonly_text`, `ViewEvent::table_select` / `table_activate`. Closes #1953.

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

crates/ide-plugin/tests/fixtures/commit/dist/plugin.wasm.sources

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