Add mid level commands

[saulshanabrook]

Try adding a few commands that allow more metaprogramming like functionality, in response to @philzook58's blog post: https://www.philipzucker.com/egglog_z3_simp/

[codspeed-hq]

CodSpeed Performance Report

Merging #177 will not alter performance

_{Comparing mid-ir (0adeae3) with main (cb485a2)}

Summary

✅ 7 untouched benchmarks

[saulshanabrook]

Closing for now due to lack of interest. Happy to update this if anyone needs it.