feat(atoll): implement first cut ATOLL implementation

[rahulk29]

• wip: atoll API
• wip
• basic port extraction

[codecov]

Codecov Report

Attention: 698 lines in your changes are missing coverage. Please review.

Comparison is base (264d028) 39.54% compared to head (7575442) 40.93%.

Files	Patch %	Lines
libs/atoll/src/abs.rs	42.14%	90 Missing and 83 partials ⚠️
libs/atoll/src/lib.rs	41.20%	55 Missing and 72 partials ⚠️
tests/src/atoll/mod.rs	22.65%	6 Missing and 93 partials ⚠️
pdks/sky130pdk/src/atoll/mod.rs	58.59%	40 Missing and 54 partials ⚠️
libs/atoll/src/grid.rs	77.04%	27 Missing and 46 partials ⚠️
libs/atoll/src/route.rs	14.89%	10 Missing and 30 partials ⚠️
codegen/src/pdk/layers.rs	0.00%	30 Missing ⚠️
substrate/src/layout/element.rs	62.16%	10 Missing and 4 partials ⚠️
substrate/src/layout/tracks.rs	36.84%	2 Missing and 10 partials ⚠️
substrate/src/io/layout.rs	9.09%	8 Missing and 2 partials ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
+ Coverage   39.54%   40.93%   +1.38%     
==========================================
  Files         163      167       +4     
  Lines       20214    21136     +922     
  Branches     8471     8849     +378     
==========================================
+ Hits         7994     8652     +658     
+ Misses       6665     6604      -61     
- Partials     5555     5880     +325     

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