[feat] Support conversion of scaled_dot_product_attention

[mfeliz-cruise]

Description

Adds a lowering pass to unpack scaled_dot_product_attention. Required a fix to aten::sqrt converter to support int32 inputs. Uses a custom op with converter to handle bool attn_mask behavior.

https://pytorch.org/docs/stable/generated/torch.nn.functional.scaled_dot_product_attention.html

Fixes # (issue)

Type of change

Please delete options that are not relevant and/or add your own.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[narendasan]

LGTM pending CI

[peri044]

LGTM