Improve Effect imports

[wmaurer]

This PR improves Effect imports, removing support for detection of imports from @effect/io in favour of from effect.

The current version only supports detecting namespace imports.
With this PR, named imports are also supported:

import { Effect } from 'effect';
import { Effect as T } from 'effect';

Detection of namespace imports and named imports from effect is done statically using the AST.

If no namespace or named import can be found, a further check for re-exports is made using the typechecker, where the exports of each imported module is checked to see if there's an entry in the map with key Effect.

So given reExport.ts:

export * as Eff from 'effect/Effect';

then Eff (as Effect) is correctly detected:

import { Eff } from './reExport';

[changeset-bot]

🦋 Changeset detected

Latest commit: 18db525

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

This PR includes changesets to release 1 package

Name	Type
@effect/language-service	Minor

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[wmaurer]

I think this PR should be ready to go now, pending a review from @mattiamanzati
Thanks very much to @IMax153 and @fubhy for their help in modernising the repo setup!