Handle tuples as rest args

[kevinbarabash]

This finishes the work to close #653.

[codecov[bot]]

Codecov Report

Merging #683 (343b30e) into main (496348d) will decrease coverage by 0.01%. The diff coverage is 94.11%.

:exclamation: Current head 343b30e differs from pull request most recent head e4d5aae. Consider uploading reports for the commit e4d5aae to get more accurate results

@@            Coverage Diff             @@
##             main     #683      +/-   ##
==========================================
- Coverage   88.82%   88.82%   -0.01%     
==========================================
  Files         109      109              
  Lines       24111    24126      +15     
==========================================
+ Hits        21417    21430      +13     
- Misses       2694     2696       +2     

Files Changed	Coverage Δ
crates/escalier_hm/src/unify.rs	82.73% <94.11%> (+0.21%)	:arrow_up:

... and 1 file with indirect coverage changes