lex-cli: Fix TS Errors with codegen

[tcyrus]

These are fixes for the TypeScript Errors (#3230) that I encountered with the lex-cli codegen output.

The specific changes are:

• updated ts-morph to ^24.0.0
• added isTypeOnly to named imports in codegen where relevant
• use type only imports in lex-cli

The new codegen output should be functionally the same (if it was working before, it should still work). I tried to avoid making any breaking changes.

I'm already using this patched version of lex-cli for a personal project.

[tcyrus]

@matthieusieben sorry to poke, but I wanted to ask if there's anything blocking this from getting merged. I wanted to remove the patchfile from my repo as soon as possible.

[matthieusieben]

We are working on a major upgrade of the api package. I'm waiting for it to be merged before I come back to this one. I'm keeping this on my radar, I promise !

[tcyrus]

Gotcha. I'll remove the changes that are covered by your PR to make the merge conflicts a bit easier to deal with.

[tcyrus]

I squashed everything to remove the merge commit.

There's a Windows issue that prevents me from building + testing the repo (details). I'll submit an Issue / PR for this one too.

I don't think I can resolve the "This branch must not contain merge commits." error from GitHub on my end. This is probably because there are merge commits that predate my PR in the branch that I can't remove.

[tcyrus]

Rebuilt the lockfile so PR can run

[tcyrus]

Fixed Lint Issue since that's the only thing failing for the PR