Move basic function type inference to squiggle-lang

[OAGr]

We used to do basic user function type inference in the Components. This tries to move most of that work to squiggle-lang. The downside is that this does add substantial complexity to squiggle-lang. The upside is that this seems like stuff we likely want there anyway, and after this, the functionality works a bit better (it's better thought through).

I think this general direction is good, but am sure this implementation can be improved a lot.

Some thoughts:

• The frType work here would help in this PR.
• This is clearly fairly messy.
• This is reusing frTypes for some things frTypes isn't fully meant for. If we go in this direction, I imagine we should add the type frUnknown, and likely frWithDomain. After we do this, we might be able to remove Domain from SqLambdaParameter - exporting the types instead. We'd also want some more helpers like getDomain(FrType<any>), if the domain is nested.
• A different direction is to make a different type that's almost exactly like frTypes, but without the packing / unpacking. I think it would likely still need the other attributes.

This closes #2761, among other things.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e681c2e) 71.56% compared to head (0c0d119) 71.75%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2767      +/-   ##
==========================================
+ Coverage   71.56%   71.75%   +0.18%     
==========================================
  Files         118      118              
  Lines        6465     6574     +109     
  Branches     1318     1360      +42     
==========================================
+ Hits         4627     4717      +90     
- Misses       1830     1849      +19     
  Partials        8        8              

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