fix mode hashing and change gdslib branch to main

[joamatab]

• fix mode hashing for tidy3d mode solver. Add plot_power=True flag that can also plot field if False.
• change gdslib branch to main
• install gdslib in $HOME/.gdsfactory
• remove empty cells from notebooks

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.53%.

Quality metrics	Before	After	Change
Complexity	6.89 ⭐	6.75 ⭐	-0.14 👍
Method Length	125.69 😞	127.32 😞	1.63 👎
Working memory	15.13 😞	15.39 ⛔	0.26 👎
Quality	49.79% 😞	49.26% 😞	-0.53% 👎

Other metrics	Before	After	Change
Lines	1130	1222	92

Changed files	Quality Before	Quality After	Quality Change
gdsfactory/simulation/fem/mode_solver.py	33.22% 😞	33.22% 😞	0.00%
gdsfactory/simulation/gtidy3d/modes.py	51.60% 🙂	50.93% 🙂	-0.67% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
gdsfactory/simulation/gtidy3d/modes.py	Waveguide.compute_modes	19 😞	826 ⛔	28 ⛔	17.37% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
gdsfactory/simulation/fem/mode_solver.py	compute_cross_section_modes	12 🙂	386 ⛔	22 ⛔	26.39% 😞	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/simulation/gtidy3d/modes.py	Waveguide.get_n	11 🙂	497 ⛔	19 ⛔	28.01% 😞	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/simulation/gtidy3d/modes.py	plot	8 ⭐	191 😞	17 ⛔	41.27% 😞	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/simulation/gtidy3d/modes.py	plot_sweep_width	5 ⭐	206 ⛔	13 😞	47.80% 😞	Try splitting into smaller methods. Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

---

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[codecov]

Codecov Report

Merging #1151 (78bbf2a) into main (9cecd8b) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1151      +/-   ##
==========================================
- Coverage   73.01%   73.00%   -0.01%     
==========================================
  Files         450      450              
  Lines       22751    22751              
  Branches     3015     3015              
==========================================
- Hits        16611    16609       -2     
- Misses       5235     5236       +1     
- Partials      905      906       +1     

Impacted Files	Coverage Δ
gdsfactory/read/from_yaml.py	67.26% <0.00%> (-0.61%)	⬇️

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