Report error when a project has multiple definitions for an operation instead of crashing

[Cellule]

Closes #252

The resulting behavior is an error in the console that can the be recovered instead of crashing the server up to 5 times before vs code requires a full reload to resume operations. In my case, devs sometimes copy/paste an operation (it's wrong I know, but it happens). GraphQL Codegen doesn't alert on it because the 2 operations are exactly the same, no harm no foul. But having this extension crash without any meaningful error message makes it really for us to fix our stuff.

I tried a production build and replaced it in my extension folder. This is the result I'm seeing.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 390f829c1aee9df3401ea9ba51110482e8c42b8e

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

This PR includes changesets to release 1 package

Name	Type
vscode-apollo	Patch

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