telemetry(lsp): Integrate language server/manifest resolver telemetry

[Hweinstock]

Problem

LSP downloading processes does not emit any telemetry.

Solution

Refactoring

• separate verification from core downloading steps so that we can capture it as its own telemetry event.
• Note: this refactor means that if all the downloaded content cannot be verified, no files will be written to disk.
• Introduce abstraction of StageResolver to make telemetry instrumentation more natural.

Metric Behavior

• metric for each stage of the LSP setup process.
• can be emitted multiple times per stage to capture specific error codes. See tests for examples.
• Commons repo PR: telemetry(lsp): standardize setup metric and types aws-toolkit-common#961
• bumped commons version to 1.0.296 to include this change.

Testing

• adds basic tests for ManifestResolver in packages/core/src/test/shared/lsp/manifestResolver.test.ts.
• adds basic tests for LanguageServerResolver in packages/core/src/test/shared/lsp/lspResolver.test.ts.
• Currently LanguageServerResolver only supports mac, so its tests skip on non-mac platforms. There is a techdebt test to address this.

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• Your code changes must meet the guidelines in CONTRIBUTING.md.
• License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.