feat: changelog notification on extension update

[mohanraj-r]

Is your feature request related to a problem? Please describe.
Increase visibility of the contents of SFDX Changelog - Marketplace.

Describe the solution you'd like

• A notification prompt when the extension updates
  • Highlight new features, fixes since last release
    • Brief GIF demos of the new features (similar to Visual Studio Code Updates)
  • Link to Change log for more details
  • Users can provide feedback/rating on the recently added features/fixes
    • And/Or Add/Update rating on the extension in vscode marketplace
• A command e.g. SFDX: What's New to access this info

Describe alternatives you've considered

• SFDX Changelog - Marketplace
• salesforcedx-vscode/CHANGELOG.md at develop · forcedotcom/salesforcedx-vscode

Additional context

• @AnanyaJha 's earlier attempt display release notes on update · forcedotcom/salesforcedx-vscode@518879c
• visual studio code - How can I display a message when someone updates to a new version of my extension? - Stack Overflow

Ref Extensions that have this workflow

• fabric8-analytics/fabric8-analytics-vscode-extension: Red Hat Dependency Analytics extension