refactor: ♻️ Refactor CodeBaseIndexer out of core

[chezsmithy]

Description

Refector CodeBaseIndexer out of core.ts in a way that it can be independently passed to tools which might need to perform reindexing. Not in #5564 we would now pass core (this.codeBaseIndexer) to the tools implementations rather than the the entire core object.

Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

[ For visual changes, include screenshots. Screen recordings are particularly helpful, and appreciated! ]

Tests

I've manually tested the following in debug:

1. At startup Indexing starts and suceeds.
2. Force Reindex works.
3. Rebuild index works.
4. Pausing and resuming indexing work.
5. Files in the test project show up in the index confirmed by using @files to lookup test.js

I've added new tests for CodeBaseIndexer.ts to cover the changes.

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[chezsmithy]

@Patrick-Erichsen related to #5564 I've performed a refactor of CodeBaseIndxer.ts and core.ts to refactor the indexing functions out of core. I'm going to note a few questions in a self review for you.

[Patrick-Erichsen]

This is a great cleanup, will make the callTools logic we originally discussed less dependent on core and this is just a solid cleanup in general. Nice we we can remove the awkward codebaseIndexerResolve things.

Going to wait to merge until I double check with @sestinj on that one comment but otherwise good to go 🚀

[sestinj]

All good to go from me except I think we should just completely remove "continue.giveAutocompleteFeedback"

[sestinj]

all looks great. as we're removing the continueServerClient, let's take out the "continue.giveAutocompleteFeedback" command in VS Code

[chezsmithy]

Waiting on #5937 to merge to fix CD/CI issues.

[chezsmithy]

@Patrick-Erichsen and @sestinj looks like we have 🟢 lights. Could you please review at your convienence? 🙇