[mlir][linalg] Add scf.for loop peeling to codegen strategy

Only scf.for loops are supported at the moment. linalg.tiled_loop support will be added in a subsequent commit.

Only static tensor sizes are supported. Loops for dynamic tensor sizes can be peeled, but the generated code is not optimal due to a missing canonicalization pattern.

Differential Revision: https://reviews.llvm.org/D109043