Speed up network generation

[zktuong]

found a few places that sped up the creation of the networks.
added new options to toggle to tl.generate network

expanded_only: bool = False # whether to only generate the layout for the expanded slot.

use_existing_graph: bool = True # whether to skip the computing of edges and just use the graph that is already computed to regenerate the layout.

[codecov]

Codecov Report

Merging #319 (9201d88) into master (d63b2f0) will increase coverage by 0.05%.
The diff coverage is 93.66%.

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
+ Coverage   82.96%   83.01%   +0.05%     
==========================================
  Files          47       47              
  Lines        8520     8551      +31     
==========================================
+ Hits         7069     7099      +30     
- Misses       1451     1452       +1     

Flag	Coverage Δ
unittests	83.01% <93.66%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
dandelion/utilities/_utilities.py	84.98% <ø> (-0.13%)	⬇️
tests/test_mouse.py	100.00% <100.00%> (ø)
dandelion/tools/_network.py	75.80% <93.33%> (+1.06%)	⬆️

[zktuong]

some breaking changes here. need to revert . going to try and restore this through #336 and #335