Add max_recursion_depth option

[RalfG]

Added

• Added max_recursion_depth argument to CascadeConfig to limit the depth of
  hierarchically updating nested dictionaries. When the maximum nesting depth is
  exceeded, the new dictionary will be used as-is, overwriting any previous
  values under that dictionary tree.

[codecov]

Codecov Report

Merging #6 (4b82c94) into main (7108e2a) will increase coverage by 0.33%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   89.83%   90.16%   +0.33%     
==========================================
  Files           1        1              
  Lines         118      122       +4     
==========================================
+ Hits          106      110       +4     
  Misses         12       12              

Impacted Files	Coverage Δ
cascade_config.py	90.16% <87.50%> (+0.33%)	⬆️