feat(plugins): let plugins show inlay hints in any language (#1937)

A new optional inlay-hints-provider export (worlds plugin-inlay-hints / inlay-hints), declared as the inlay-hints provider kind for any language (API 1.3). The host asks the language server and the plugins together for the visible range and returns both in position order; with no server hints the plugins' hints still show. Kinds map to the Inlay Hints settings; labels, tooltips and counts are capped.

Co-authored-by: yzPeedro <[email protected]>

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

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