re-introduce query exec as separate extension

[acao]

a starting point, based on
https://github.com/graphql/vscode-graphql

TODO:

• as with vscode-graphql, port to the latest vscode-anguageserver-client using vscode-anguageserver-client/node import
• fix embarassing package.json typos haha
• perhaps port the source provider codelens uses to locate tags to use parseDocument from graphql-language-service-server, and share parity with the LSP server's tag selection (expands on what is currently supported here
• add test to make sure codelens is working
• separate graphql config into a separate plugin? and how?
• add e2e suite because this could be flaky in the past, and making it a seperate extension from vscode-graphql makes manual testing more cumbersome

[changeset-bot]

🦋 Changeset detected

Latest commit: 761e92c

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

This PR includes changesets to release 2 packages

Name	Type
vscode-graphql-execution	Patch
vscode-graphql	Patch

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[github-actions]

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[acao]

oof... i accidentally clobbered a ton of progress on this with a force push, and the only surviving local copy of this branch with enhancements is on another computer