🔧 Improve linting, docstring formatting, and type hints

[munechika-koyo]

Key changes include:

• Updated linting configurations and removed unnecessary dependencies.

• Migrated docstring linting to ruff and enhanced docstring formats for compatibility with napoleon.

• Added type hints across multiple modules for better clarity and type checking.

• Fixed bugs related to data loading functions and improved documentation consistency.

• Updated the CHANGELOG for version 0.2.1.

[codecov]

Codecov Report

❌ Patch coverage is 87.75510% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.28%. Comparing base (a1005d9) to head (6506886).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/cherab/imas/ggd/unstruct_2d_extend_mesh.py	80.55%	7 Missing ⚠️
src/cherab/imas/ids/common/ggd/load_unstruct_3d.py	16.66%	5 Missing ⚠️
src/cherab/imas/ggd/unstruct_2d_mesh.py	91.89%	3 Missing ⚠️
...rc/cherab/imas/ids/equilibrium/load_equilibrium.py	86.66%	2 Missing ⚠️
src/cherab/imas/plasma/core.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   53.93%   55.28%   +1.34%     
==========================================
  Files          38       38              
  Lines        1780     1827      +47     
  Branches      315      316       +1     
==========================================
+ Hits          960     1010      +50     
+ Misses        700      697       -3     
  Partials      120      120              

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