chore: prepare v0.1.0-alpha.3 release

[Hector Hernandez (hectorhdzg)]

• Bump version to 0.1.0-alpha.3 in package.json and MICROSOFT_OPENTELEMETRY_VERSION
• Add changelog entry for vendored A365 code and samples fixes

[Copilot]

Pull request overview

Prepares the @microsoft/opentelemetry package for the 0.1.0-alpha.3 release by aligning version identifiers across the codebase and documenting release notes in the changelog.

Changes:

• Bump package version to 0.1.0-alpha.3 (package.json + lockfile).
• Update MICROSOFT_OPENTELEMETRY_VERSION to 0.1.0-alpha.3.
• Add a 0.1.0-alpha.3 entry to CHANGELOG.md.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/types.ts	Updates exported distro version constant to 0.1.0-alpha.3.
package.json	Bumps published package version to 0.1.0-alpha.3.
package-lock.json	Keeps lockfile root package version in sync with package.json.
CHANGELOG.md	Adds release notes for 0.1.0-alpha.3.

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