Obey stacklevel in warnings.warn for loguru output

[nikosavola]

As an example, these two statements are now both printed with the same linenumber in the same file

Loguru

2024-04-05 12:15:41.127 | WARNING  | gdsfactory.pdk:get_cross_section:532 - UserWarning: CrossSection.copy() only modifies the attributes of the first section.

Warnings

/home/niko/dev/gdsfactory/gdsfactory/pdk.py:532: UserWarning: CrossSection.copy() only modifies the attributes of the first section.
  return cross_section.copy(**kwargs)

Additionally, disables using warnings.showwarnings and makes the gdsfactory defaults only print using loguru, closes #2588

[github-actions]

Label error. Requires at least 1 of: breaking, bug, github_actions, documentation, dependencies, enhancement, feature, maintenance, security. Found: python

[sourcery-ai]

Hey @nikosavola - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟡 Complexity: 1 issue found
• 🟢 Docstrings: all looks good

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 71.77%. Comparing base (2d77845) to head (f1502ef).

Files	Patch %	Lines
gdsfactory/config.py	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2656      +/-   ##
==========================================
- Coverage   71.79%   71.77%   -0.02%     
==========================================
  Files         366      366              
  Lines       23754    23756       +2     
  Branches     3873     3874       +1     
==========================================
- Hits        17053    17052       -1     
- Misses       5576     5578       +2     
- Partials     1125     1126       +1     

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