Distinct run_genus synthesis step, ICV LVS blackbox support, and Virtuoso netlist export support

[daniellovell]

Commit: /synthesis/genus make run_genus a distinct step

• This is useful/necessary for hooks which inject behaviors AFTER the syn.tcl file has been generated.

Commit: lvs/icv add lvs.icv.equiv_files for blackboxes

• Equivalence files are used by ICV LVS to define LVS boxes/blackboxes. This is an extremeley useful feature for debugging LVS & running LVS quickly.

Commit: utils/ get_filetype add ".net" as supported ext.

• Cadence Virtuoso will produce netlists with the .src.net extension when streaming out schematics as netlists (i.e. when running Calibre nmLVS in Virtuoso)

Related PRs / Issues
N/A

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• Change to core Hammer
• Change to a Hammer plugin
• Other

Contributor Checklist:

• Did you set master as the base branch?
• Did you state the type-of-change/impact?
• Did you delete any extraneous prints/debugging code?
• (If applicable) Did you add documentation for the feature?
• (If applicable) Did you update the poetry.lock file if you updated the requirements in pyproject.toml?
• (If applicable) Did you add a unit test demonstrating the PR?
• (If applicable) Did you run this through the e2e integration tests?
• (If applicable) Did you update the submodules in e2e/ if this feature depends on updated plugins?