Small improvements

[sssserrano]

Description

• Replace deprecated logging.warn with logging.warning
• Replace unnecessary instance methods with static methods
• Fix typos
• Fix return types and doc strings
• Replace argument names that shadow built-in keywords with trailing (according to PEP8 naming style)
• Remove unnecessary parenthesis
• Fix argument signature in load_data method in BaseLoader
• Simplify boolean comparisons
• Remove unused config_info variables

Type of change

• [X] Refactor (does not change functionality, e.g. code style improvements, linting)
• [X] Documentation update

How Has This Been Tested?

• [X] Unit Test

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [X] I have checked my code and corrected any misspellings

Maintainer Checklist

• [ ] closes #xxxx
• [ ] Made sure Checks passed

[codecov[bot]]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (1b661bb) 56.17% compared to head (31ee87b) 56.34%. Report is 8 commits behind head on main.

Files	Patch %	Lines
embedchain/loaders/github.py	60.00%	4 Missing :warning:
embedchain/store/assistants.py	0.00%	4 Missing :warning:
embedchain/embedder/google.py	0.00%	2 Missing :warning:
embedchain/loaders/image.py	0.00%	2 Missing :warning:
embedchain/vectordb/zilliz.py	33.33%	2 Missing :warning:
embedchain/embedchain.py	83.33%	1 Missing :warning:
embedchain/llm/google.py	0.00%	1 Missing :warning:
embedchain/loaders/directory_loader.py	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1129      +/-   ##
==========================================
+ Coverage   56.17%   56.34%   +0.16%     
==========================================
  Files         134      134              
  Lines        5362     5392      +30     
==========================================
+ Hits         3012     3038      +26     
- Misses       2350     2354       +4     

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