transformations: ptr -> riscv conversion

[mamanain]

Part 3 of introducing ptr dialect to snitch compilation. Pass to lower ptr to riscv.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.16%. Comparing base (87e1a46) to head (fa2ca63).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3393      +/-   ##
==========================================
+ Coverage   90.13%   90.16%   +0.02%     
==========================================
  Files         452      455       +3     
  Lines       57157    57332     +175     
  Branches     5498     5511      +13     
==========================================
+ Hits        51519    51692     +173     
- Misses       4180     4186       +6     
+ Partials     1458     1454       -4     

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