[vscode-graphql] fix Svelte support

[aloker]

Fixes #2857

The LSP server wasn't registered for svelte files.

Note: the PR does not have tests

[changeset-bot]

🦋 Changeset detected

Latest commit: 06d3cb6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
graphql-language-service-server	Patch
vscode-graphql	Patch
graphql-language-service-cli	Patch

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: aloker / name: Andre Loker (01f6b4a, fbbcd59)

[acao]

@aloker one missing piece - just need to add .svelte to this array here:
https://github.com/graphql/graphiql/blob/main/packages/graphql-language-service-server/src/parseDocument.ts#L8

otherwise, the langauge server will pick up svelte files, but do nothing with them

also as per the comments:

• CLA if you can (using the same email the commits are signed with)
• changeset so that a bugfix is published - we need to include both vscode-graphql and graphql-language-service-server so that other IDE implementations will see the changelog entry (because vim users are also not able to handle .svelte files for graphql features - vscode-graphql and various vim, sublime, etc extensions all use this server!)

[aloker]

I signed the CLA and added the missing change and the changeset.

[acao]

thank you @aloker ! I will now merge the release PR once it's created

[acao]

@aloker latest @0.8.1 is the fix version. awesome work. I'll add more comprehensive tests because I suspect the vue parser might fail with more advanced attribute binding usage, but if it works fine for you and the svelte community then that's awesome!

[aloker]

That's 0.8.2, right? I'll have to test it on an actual project. Thanks for the quick merge & release!