Feature: Accept string resources for the HTML or Markdown conversion to PDF routes

[stumpylog]

This now includes accepting strings for resources which can be strings, such as the index.html or other resource files referred to by the index.html or primary Markdown file, such as fonts or CSS.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.36066% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.53%. Comparing base (7dfe72c) to head (f9e3f4e).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/gotenberg_client/_base.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #30      +/-   ##
===========================================
- Coverage    99.60%   99.53%   -0.07%     
===========================================
  Files           25       25              
  Lines         1255     1289      +34     
===========================================
+ Hits          1250     1283      +33     
- Misses           5        6       +1     

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