Investigate what parts of Aegis can be ported/integrated into HEIR

Discovered this from an awesome-FHE PR: https://github.com/primus-labs/Aegis

MLIR-based FHE compiler with a python frontend, using OpenFHE as backend, licensed under Apache 2, which appears to have a pretty robust ONXX->FHE pipeline?

It also looks like it's got a python AST->MLIR frontend that supports a bunch of ML stuff, so that might be interesting to take a look at?

Developed by https://primuslabs.xyz/ (formerly PADO?), which I'm not familiar with.