Refactor typing

[scolby33]

• Split the API functionality into separate mixin-ish classes based on their organization in the Pushover documentation
• Add missing/new API's
• Add type hints
• Update the documentation to handle the new type hints and argument passing style, including good examples of usage and reasonable sectioning of the functionality

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.87179% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.04%. Comparing base (e46b107) to head (8cf68e8).

Files with missing lines	Patch %	Lines
src/pushover_complete/message_api.py	93.10%	3 Missing and 1 partial ⚠️
src/pushover_complete/licensing_api.py	81.25%	2 Missing and 1 partial ⚠️
src/pushover_complete/groups_api.py	95.00%	2 Missing ⚠️
src/pushover_complete/subscription_api.py	92.30%	1 Missing and 1 partial ⚠️
src/pushover_complete/receipt_and_callback_api.py	96.96%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #31      +/-   ##
===========================================
- Coverage   100.00%   95.04%   -4.96%     
===========================================
  Files            3       10       +7     
  Lines           97      242     +145     
  Branches         8       14       +6     
===========================================
+ Hits            97      230     +133     
- Misses           0        9       +9     
- Partials         0        3       +3     

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