implemented within typescript-auto-import-cache dependency

This transform bind:this={get, set} with a similar method as bind:this={ele}, but by invoking the set function. The get function is ignored.

…ore (#2780)

#2772

#2762

…2779)

#2773

This delays the file reading in svelte-check --watch until we're sure the new file is a project file. I still added a file existence check before reading, but it might be more of a fail-safe because the chance of it being deleted at this point is much smaller.

While checking this, I also found that the new file watch is broken because it now caches the tsconfig parsing result. So I changed the "read the config again" logic to the one language server used to invalidate the project files cache.

#2375.
Adding support in the Svelte language server so that you don't need to open ts/js files to use this feature. You can trigger this feature with Ctrl + T and search for symbol names. Some of the handling is also synced to the typescript-plugin so that it's more consistent, which also means vscode can better deduplicate the results from both tsserver and Svelte language server.