Feat/darts options

[dennisbader]

Checklist before merging this PR:

• Mentioned all issues that this PR fixes or addresses.
• Summarized the updates of this PR under Summary.
• Added an entry under Unreleased in the Changelog.

Fixes #2380.

Summary

• Adds a new configuration system for Darts, similar to pandas' options and settings.
  • Users can now configure global behavior such as:
    • display.[max_rows, max_cols]: Maximum number of rows or columns to display in TimeSeries representation (default: 10)
    • plotting.use_darts_style: Whether to apply Darts' custom matplotlib plotting style (default: True). Changes take effect immediately and apply to all subsequent plots.
  • The configuration API includes: get_option(), set_option(), reset_option(), describe_option(), and option_context() for temporary changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.55%. Comparing base (b1d45b5) to head (5d7db09).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2956      +/-   ##
==========================================
- Coverage   95.59%   95.55%   -0.04%     
==========================================
  Files         152      153       +1     
  Lines       16297    16403     +106     
==========================================
+ Hits        15579    15674      +95     
- Misses        718      729      +11     

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