feat: add ability to clear/cap cache size

[tlambert03]

fixes #30

@aditya306b, let me know if this would work for you

New caching functionalities:

• Added clear_api_cache function to clear all cached responses to the Iconify API from the current session in src/pyconify/api.py.
• Added set_api_cache_maxsize function to set the lru_cache max size for all API calls and clear the cache in src/pyconify/api.py.

Updates to existing cache mechanisms:

• Updated collections, collection, svg_path, and css functions to use functools.lru_cache with a default max size of 128 in src/pyconify/api.py. [1] [2] [3] [4]

Tests:

• Added test_clear_api_cache to verify the functionality of the new cache-related functions in tests/test_pyconify.py.

Imports and type annotations:

• Added Any, Protocol, and cast imports to support the new cache functionalities in src/pyconify/api.py. [1] [2]

Module exports:

• Updated __init__.py to export the new clear_api_cache and set_api_cache_maxsize functions. [1] [2] [3]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (82e5515) to head (b7c738d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #31   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          261       276   +15     
=========================================
+ Hits           261       276   +15     

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