Use semver package for semantic version comparison and precedence checking

[henrymercer]

This PR refactors the CLI distribution manager to use the semver package. This:

• fixes an issue with precedence checking where versions with prereleases were not compared correctly with versions without prereleases (CLI version sorting potentially wrong #424)
• simplifies defining what versions of the CLI are compatible with the extension
• removes code implementing semver parsing and precedence checking

Other points to note:

• Semantic versions are parsed using semver.parse rather than semver.coerce since semver.coerce strips build metadata.
• Semantic versions are formatted using version.raw since this includes build metadata.
• Release creation dates are now compared using the en-US locale to remove potential locale dependence of version comparison.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• @github/product-docs-dsp has been cc'd in all issues for UI or other user-facing changes made by this pull request.

Fixes #424