[vscode-graphql-syntax] Add support for GraphQL embedded in Hack files

[dunnbobcat]

Summary: This adds support for GraphQL strings within Hack files, bootstrapped from the existing PHP version. I followed the steps outlined in the README.

Test Plan:

• yarn test -u from package root
• yarn vsce:package and install resulting VSIX
• Load test.hack in VS Code
• Observe nice syntax highlighting for GraphQL

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 261039b71ea5fdecdce9c3130071da94a949a8d7

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

This PR includes changesets to release 1 package

Name	Type
vscode-graphql-syntax	Minor

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[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: dunnbobcat / name: Bobcat (db77a2c2497ffa53545c3f5bafc7956ee5915f6b, 05537711da39baeef815c7f9032e989ab328cfaa, eb3b6ae09a5324feab0d26e13de0b2cab2f0a685, 6d9f1e19d21dcc3157fb0352d65fed9fc7630c46, 261039b71ea5fdecdce9c3130071da94a949a8d7)

[dunnbobcat]

@acao apologies for my GitHub noobiness, but does your force push mean this will be released? If not, is there anything I need to do to get this over the line? Thanks in advance :)

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 63.96%. Comparing base (0d9e51a) to head (eb3b6ae). :warning: Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3872   +/-   ##
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  Coverage   63.96%   63.96%           
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  Files          35       35           
  Lines        3086     3086           
  Branches      948      949    +1     
=======================================
  Hits         1974     1974           
  Misses       1107     1107           
  Partials        5        5           

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