feat(cli): add upgrade information on startup

[DESU-CLUB]

Closes #277

Summary

• Adds a startup routine that prints the current version and whether an update is available
• Refactored internal logic for cmd.ts
  • checkForUpdates (packages/cli/upgrade/version-check.ts) and registerUpgradeCommand (packages/cli/upgrade/cmd.ts) now internally use returnVersionInfo, to de-duplicate potentially redundant code
• Added program preAction hook that runs version-check before any command

How to run

Building from source (Github)

• Fetch this pull request
• Run bun install in the root folder
• Run bun run build in packages/cli
• Run ./dist/pochi -<command>: The upgrade information should be shown on display

Running using bun

• Fetch this pull request
• Run bun install in the root folder
• Run bun run pochi -<command>: The upgrade information should be shown

Known Issues

• The display feature does not show during pochi -V and pochi -h. This is as CommanderJS do not treat the help and version actions as commands and exits early.

TODO

• Check with Tabby team if the upgrade display should show when pochi -V (show current version) and pochi -h (Show help) [Current implementation does not show when these commands are called]
• Check with Tabby team if the console.log in upgrade command stating new version is redundant
• Test on Windows and MacOS machines
• Update documentation with note that now upgrade is displayed on startup (Doesn't seem like it belongs in docs, which talks about core features rather than UI changes)

Display Preview

Display Preview with prompt command

Display Preview with upgrade command

[zwpaper]

Hi @DESU-CLUB , there are some UX comments and nits, please have a look and ping me if you have any questions

[DESU-CLUB]

@zwpaper Thank you for the feedback! Have resolved the nits, and left comments for clarifications on one of the comments!

[zwpaper]

Hi @DESU-CLUB, one last nit, otherwise LGTM