test(python): Improve hypothesis strategy for decimals

[stinodego]

It's now possible to supply a precision/scale and the proper decimal values will be generated.

I also set up the dtype_strategies strategy which will be key to upgrading the list/array strategies (these need to be converted to a composite strategy).

Next step will be to set up a dtypes strategy which generates a random Polars data type. This will be used by the list/array strategies. Then I will upgrade the list/array strategies and we can finally upgrade to the latest hypothesis version.

[codecov]

Codecov Report

Attention: Patch coverage is 65.51724% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 80.89%. Comparing base (c3c5bef) to head (2a025d7).

Files	Patch %	Lines
py-polars/polars/testing/parametric/strategies.py	64.28%	5 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16001      +/-   ##
==========================================
- Coverage   80.91%   80.89%   -0.02%     
==========================================
  Files        1384     1384              
  Lines      178112   178132      +20     
  Branches     3043     3050       +7     
==========================================
- Hits       144113   144107       -6     
- Misses      33515    33537      +22     
- Partials      484      488       +4     

Flag	Coverage Δ
python	74.37% <65.51%> (-0.03%)	⬇️
rust	78.11% <31.03%> (+0.06%)	⬆️

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[alexander-beedie]

Nice :)