docs: add gdalle as a contributor for code, doc, and 6 more

[allcontributors]

Adds @gdalle as a contributor for code, doc, ideas, maintenance, research, review, test, talk.

This was requested by gdalle in this comment

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.86%. Comparing base (687ef25) to head (7c0a3f6).
⚠️ Report is 3 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (687ef25) and HEAD (7c0a3f6). Click for more details.

HEAD has 20 uploads less than BASE

Flag	BASE (687ef25)	HEAD (7c0a3f6)
DI	40	20

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1033       +/-   ##
===========================================
- Coverage   98.10%   79.86%   -18.24%     
===========================================
  Files         138      135        -3     
  Lines        8131     8066       -65     
===========================================
- Hits         7977     6442     -1535     
- Misses        154     1624     +1470     

Flag	Coverage Δ
DI	73.62% <ø> (-25.20%)	⬇️
DIT	96.22% <ø> (ø)

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