Add Functionalities

[parantak]

1. Added preprocessing class, @someshsingh22 and @rajaswa , please check if this implementation would work.
2. Added Optimal String Alignment (OSA) to Levenshtein, and made minor code changes to the original implementation
3. Made minor documentation additions/changes.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #75 into master will increase coverage by 0.08%.
The diff coverage is 96.55%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   94.91%   95.00%   +0.08%     
==========================================
  Files           8       10       +2     
  Lines         334      360      +26     
==========================================
+ Hits          317      342      +25     
- Misses         17       18       +1     

Impacted Files	Coverage Δ
decepticonlp/preprocessing/preprocessing.py	95.23% <95.23%> (ø)
decepticonlp/__init__.py	100.00% <100.00%> (ø)
decepticonlp/metrics/char_metrics.py	100.00% <100.00%> (ø)
decepticonlp/preprocessing/__init__.py	100.00% <100.00%> (ø)

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[someshsingh22]

Preprocessing is perfect, but I don't know if OSA is used in literature because it is not a true metric

[someshsingh22]

Also I would recommend to make PR from branches when you are making several changes, for example suppose we wish to continue with Preprocessing and not OSA you will have to roll back changes, these are completely parallel, so you can instead make two branches OSA and preprocessing and make separate PRs

[parantak]

@someshsingh22 , I know it isn't a true metric, but then the thing is it captures a swap perfectly (in our case the swap perturbation), without allowing that subsequence to be edited any further, which is why I included it an option in Levenshtein itself, and not as a separate metric.
As for the complete metric, I have already included Damerau-Levenshtein. Tell me if you still want me to remove it, and I'll roll back certain changes.