happy svelte parsing

[acao]

This is a revival of an effort from #3204 by @tadeokondrak to add more comprehensive svelte parsing by using the svelte compiler

I think this test case covers some more advanced usage?

Todo:

• mark new svelte parsers as external for esbuild, manually test esbuild bundling & vsix

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[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (9b6ce25) 55.81% compared to head (1046638) 55.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3366      +/-   ##
==========================================
+ Coverage   55.81%   55.85%   +0.04%     
==========================================
  Files         110      114       +4     
  Lines        5273     5303      +30     
  Branches     1439     1441       +2     
==========================================
+ Hits         2943     2962      +19     
- Misses       1901     1911      +10     
- Partials      429      430       +1     

Files	Coverage Δ
...raphql-language-service-server/src/GraphQLCache.ts	50.88% <100.00%> (ø)
...ql-language-service-server/src/MessageProcessor.ts	45.83% <ø> (ø)
...s/graphql-language-service-server/src/constants.ts	100.00% <100.00%> (ø)
...aphql-language-service-server/src/parseDocument.ts	86.66% <100.00%> (+7.71%)	⬆️
...phql-language-service-server/src/parsers/svelte.ts	75.00% <75.00%> (ø)
...aphql-language-service-server/src/parsers/babel.ts	77.77% <77.77%> (ø)
...hql-language-service-server/src/findGraphQLTags.ts	82.71% <75.00%> (+0.30%)	⬆️
...graphql-language-service-server/src/parsers/vue.ts	57.69% <57.69%> (ø)