Sigmoid Activation function implementation with simplified batch calc…

[crapxxi]

…ulation

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new algorithms include a corresponding test class that validates their functionality.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.17%. Comparing base (734a7a4) to head (8728470).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ava/com/thealgorithms/maths/SigmoidActivation.java	92.85%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7609      +/-   ##
============================================
+ Coverage     81.11%   81.17%   +0.05%     
- Complexity     7814     7863      +49     
============================================
  Files           827      829       +2     
  Lines         24742    24879     +137     
  Branches       4833     4855      +22     
============================================
+ Hits          20070    20195     +125     
- Misses         3906     3911       +5     
- Partials        766      773       +7     

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