Added parameter to `sd.concatenate` to control whether to merge coordinate systems with the same name

[timtreis]

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 92.15%. Comparing base (872f8c2) to head (5c5fb38). :warning: Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #919   +/-   ##
=======================================
  Coverage   92.14%   92.15%           
=======================================
  Files          48       48           
  Lines        7473     7479    +6     
=======================================
+ Hits         6886     6892    +6     
  Misses        587      587           

Files with missing lines	Coverage Δ
src/spatialdata/_core/concatenate.py	92.42% <100.00%> (+0.36%)	:arrow_up:

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[LucaMarconato]

@timtreis I gave comments on the code and committed the suggestions that I made during review. Please have a look at the changes and if you are happy with them we can merge.