chore (cli): extract cli to separate package

[kevin-dp]

This PR extracts the CLI out of the electric-sql package and into its own @electric-sql/cli package.

TODO:

• We may want to add .js extension to every import to avoid having to run the fix-imports.js script.

[linear]

VAX-1887 Extract CLI to separate package

[msfstef]

Nice work, looks good! Left some minor comments mostly relating to having some way to share configs (eslint, prettier, tsconfig) and utilities (like fix-imports.js) which can be addressed in a separate PR

[msfstef]

nit: perhaps we also want to factor this out as a common utility between packages (although really I'd like us to find a way to not need this altogether haha) - maybe as an unpublished pnpm package?

[samwillis]

This landed in #659 and was also discussed in the abandoned #642

#642 would have gone with the "use .js imports everywhere route". Personally I would go that way with any new package (it's what I've done with PGlite) but there was push back and we landed on this somewhat ugly hack.

[kevin-dp]

Agree with Sam, i would prefer the use .js imports route. I might update all imports in the CLI package after rebasing and including the changes made to the CLI in concurrent PRs.