feat(amazonq): Add language server support for codewhisperer

[jpinkney-aws]

Problem

• Amazon q completions currently use a custom implementation. Instead, we can leverage the codewhisperer implementation in the language-servers repository to provide this information for us

Solution

• Implement manifest downloading, lsp resolution
• Decouple inline completion activation from codewhisperer activation
• Port workspace context language server to use the lsp installer

TODOs before this is merged

• feat(amazonq): Add lsp downloading support for windows/linux
• telemetry(lsp): Integrate language server/manifest resolver telemetry
• Add a test for workspace context server downloading
• Merging amazon q documents language server output channel with amazon q logs
• Updating the initialization options name
• Fix TODOs in LSP resolver
• Changelog

Risks

• Inline completion activation has been decoupled from other codewhisperer activation, we need to make sure everything is still getting activated and in the right order
• workspace context language server now uses the manifest downloading code

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[github-actions]

• This pull request implements a feat or fix, so it must include a changelog entry (unless the fix is for an unreleased feature). Review the changelog guidelines.
  • Note: beta or "experiment" features that have active users should announce fixes in the changelog.
  • If this is not a feature or fix, use an appropriate type from the title guidelines. For example, telemetry-only changes should use the telemetry type.