dialects: (math) folders for floating point operations

[jumerckx]

I mostly limited myself to simple floating point operations that have a clear python counterpart. Only does folding with constant operands. No other identities are taken into account.

Open questions:
I'm wondering if these folders should work for types other than f64 (like I currently made them to)?
Also, any proposal on how to test it. Just with a single arbitrary input and checking they match the python function?

[codecov]

Codecov Report

❌ Patch coverage is 33.92857% with 111 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.49%. Comparing base (ba33f21) to head (2236beb).

Files with missing lines	Patch %	Lines
xdsl/dialects/math.py	33.92%	111 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5310      +/-   ##
==========================================
- Coverage   85.67%   85.49%   -0.18%     
==========================================
  Files         373      373              
  Lines       52997    53138     +141     
  Branches     6019     6046      +27     
==========================================
+ Hits        45403    45431      +28     
- Misses       6139     6251     +112     
- Partials     1455     1456       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[jumerckx]

seems like math.cbrt and other functions don't exist in Python 3.10.