transformations: (convert-memref-to-ptr) add lower-func flag

[kaylendog]

Adds a lower-func boolean flag to convert-memref-to-ptr that rewrites function definitions and calls containing memref to use ptr.

This applies 4 additional rewrite patterns after the existing rewrites:

1. LowerMemrefFuncOpPattern
2. LowerMemrefFuncCallPattern
3. LowerMemrefFuncReturnPattern
4. ReconcileUnrealizedPtrCasts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.25%. Comparing base (3a9e8b3) to head (aed42b5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3820   +/-   ##
=======================================
  Coverage   91.25%   91.25%           
=======================================
  Files         461      461           
  Lines       57560    57635   +75     
  Branches     5549     5567   +18     
=======================================
+ Hits        52526    52596   +70     
- Misses       3609     3612    +3     
- Partials     1425     1427    +2     

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

[superlopuh]

LGTM modulo comments!

[superlopuh]

Cc @mamanain

[superlopuh]

Our PR convention is to let the commenter resolve the comment, which makes it easier to track conversations.

LMK if you'd like help with the tests.