ci(github): commit parity check based on similarity

[jagpreetsinghsasan]

Commit to be reviewed

ci(github): commit parity check based on similarity

Primary Changes
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1. Added a commit-pr similarity ratio to lessen the check strictness
2. Added an env var to the workflow to easily control the similarity
   ratio

Changes required to incorporate 1)
---------------------------------
3. Added string-similarity-js package in package.json

Fixes hyperledger-cacti#3470

Pull Request Requirements

• Rebased onto upstream/main branch and squashed into single commit to help maintainers review it more efficient and to avoid spaghetti git commit graphs that obfuscate which commit did exactly what change, when and, why.
• Have git sign off at the end of commit message to avoid being marked red. You can add -s flag when using git commit command. You may refer to this link for more information.
• Follow the Commit Linting specification. You may refer to this link for more information.

Character Limit

• Pull Request Title and Commit Subject must not exceed 72 characters (including spaces and special characters).
• Commit Message per line must not exceed 80 characters (including spaces and special characters).

A Must Read for Beginners
For rebasing and squashing, here's a must read guide for beginners.