Add a .gitattributes file

[namurphy]

This PR adds a .gitattributes file to our repository. The main benefits are:

• Consistency in line endings between different text files
• Better git diff headers for providing context to changes

This PR also makes some minor edits to .editorconfig (see also #2129), and changes some files to make sure that the line endings are consistent.

[github-actions]

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[namurphy]

The only changes in this file are line endings (CRLF → LF).

[namurphy]

The only changes in this file are line endings (CRLF → LF).

[namurphy]

The only changes in this file are line endings (CRLF → LF).

[namurphy]

Cython files (.pyx) are pretty close to Python, so the diff should work fine.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6e63ba4) 98.35% compared to head (81e22dc) 98.35%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2331   +/-   ##
=======================================
  Coverage   98.35%   98.35%           
=======================================
  Files         100      100           
  Lines        8567     8567           
=======================================
  Hits         8426     8426           
  Misses        141      141           

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