feat: make use of loose Svelte parser and provide better intellisense #2631
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This adds support for the Svelte parser with its new loose mode and adjusts code paths to make use of it properly. As a result, intellisense should be a lot more useful in situations where code is in the middle of being typed and the Svelte file is in a broken state.
Demo (note how autocompletion works in broken states):
intellisense-demo.mp4
Needs sveltejs/svelte#14691
Fixes #2499
Fixes #1916
Fixes #1884
Fixes #776
Fixes #1990
Fixes #1302