chore: move prettier and eslint configuration under package.json

[SauravMaheshkar]

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

• Move the content from .prettierrc under the prettier key in package.json. Source(prettier docs)
• Move the content from .eslintrc.js 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. This PR mirrors the change from (jupyter-server/jupyter_server#1246)

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[SauravMaheshkar]

@blink1073 Request for Review (sorry for the ping)

[blink1073]

Thank you!

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[jtpio]

Thanks @SauravMaheshkar!

Wondering if we should do the same in the extension cookiecutter as well? I opened jupyterlab/extension-cookiecutter-ts#302 to consider this.

[SauravMaheshkar]

Ofcouse @jtpio thanks for the ping. On it !!