Enable npm init @cadl-lang using @cadl-lang/create package

[nguerrera]

Two issues are discussed below but this one tracks only getting npm init @cadl-lang to work as a nicer/easier to remember command-line than npx -p @cadl-lang/compiler cadl init

The other issue, making local cadl resolve without a global cadl is tracked by #1116

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It would be nice if you could play with cadl without installing it globally via npm install -g.

I tried these steps:

md repro
cd repro
npm uninstall -g @cadl-lang/compiler # to make sure it didn't interfere
npm init -y
npm install @cadl-lang/compiler
npx cadl code install
code .

This errors starting the language server, it can't find the cadl-server executable. We should be able to make it find it off workspace root without relying on the global executable to run its resolver for this case. That should be a relatievely straight-forward fix. (EDIT: tracked by #1116)

The other problem I see in this scenario is that I can't use npx cadl init to get started because I need to npm install @cadl-lang/compiler first while cadl init templates help me to do that. Chicken and egg. (Edit: we can make npm init @cadl-lang work with a @cadl-lang/create package, this issue now tracks that.)

We should probably fix the reliance on global cadl to find local cadl (EDIT: tracked by #1116) and then at least document an alternate flow that doesn't require npm install -g.

[bterlson]

npx cadl init could probably move to something like npm init @cadl-lang as documented here, at least as an option.

[timotheeguerin]

does npx -p @cadl-lang/compiler cadl init not work?
This is definitely not optimal and having the @cadl-lang/create package would be nice to simplify but I think we can already do that.

[markcowl]

• @nguerrera please split off the init/create issue separately

[markcowl]

pri: 0
est: 5

[nguerrera]

I was supposed to split this up, but didn't yet, but looks like @timotheeguerin filed #1116 already.

[nguerrera]

So this one can be about the init part and that one can be about needing global cadl to resolve local one unnecessarily.

[timotheeguerin]

est: 3