Add functionality to compile from stablehlo

[ddilbazTT]

The idea is to read a stablehlo graph (most likely from text, as a string), then lower it to ttir-->ttnn.

The way to install stablehlo is:

pip install --pre torch-mlir torchvision
pip install stablehlo -f https://github.com/openxla/stablehlo/releases/expanded_assets/dev-wheels

The way to use stablehlo is:

import tt_mlir
import mlir.ir as ir
import mlir.dialects.stablehlo as stablehlo
from mlir.ir import Context, Location

with ir.Context() as ctx:
    stablehlo.register_dialect(ctx)
    module = ir.Module.parse(MODULE_STRING)