feat: Add customizable log level for 'username already exists' error

[KrishDave1]

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Pull Request

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• Link this pull request to an issue.

Issue

#9329

Closes: #9329

Approach

So I have created a new interface LogEventsOptions interface in src/Options/index.js to incorporate the custom logEvents option in case of username already taken error.

Then I have modified the RestWrite.js file to check for and apply the custom log level when a username already exists error occurs.I have also added documentation for the new option in src/Options/docs.js.

I have also included a new test case in spec/ParseUser.spec.js to verify the functionality of the custom log level.

If any changes are required , please inform me , I will do it.

Tasks

• [x] Add tests
• [x] Add changes to documentation (guides, repository pages, code comments)