chore: move babel and eslint configuration under package.json

[SauravMaheshkar]

Changes proposed by this PR can be summarised as follows :-

• Move the content from .babelrc under the babel key in package.json. Source(babel docs)
• Move the content from .eslintrc.json under the eslintConfig key in package.json. Source(eslint docs)
• Move the content from .eslintignore under the eslintIgnore key in package.json. Source(eslint docs)

Doing so, would lead to a more minimal project structure without any functional change.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.15 ⚠️

Comparison is base (702c248) 80.39% compared to head (acc9b62) 80.25%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1246      +/-   ##
==========================================
- Coverage   80.39%   80.25%   -0.15%     
==========================================
  Files          68       68              
  Lines        8264     8264              
  Branches     1600     1600              
==========================================
- Hits         6644     6632      -12     
- Misses       1198     1206       +8     
- Partials      422      426       +4     

see 2 files with indirect coverage changes

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[blink1073]

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