Add prettier to standardize formatting

[melloware]

###Defect Fixes
Add prettier to standardize formatting

[melloware]

@mertsincan i know this is a big change but this is a huge improvement for the code base and it will enforce all the code looks the same. Once merged I will add npm run format-check to the Actions build to make sure it doesn't pass the build if someone has not run npm run format before pushing their PR.

[mertsincan]

@melloware no problem! Good job ;)
Some Changes;

• I think 'jsxSingleQuote' can be false
• you can add npm run format-check to build-package command(before rollup -c)
• if-else-return statements are very complex. Exp; https://github.com/primefaces/primereact/pull/3173/files#diff-650bdcfa2f350584e949de0b660020ff47e9b52f3bb9b78646ce46ab006469fdR3
• Also, maybe we can ignore print-width or set a value greater than 80.
  b733a93#diff-0801a6b5af7d44dde00351b8866475aa149db5a0853767eb402b5efbcb81ed7fR153
  https://prettier.io/docs/en/options.html#print-width

[melloware]

OK I updated with jsxSingleQuote: false and printWidth: 250 also added format-check to the npm run build command

[mertsincan]

Nice! If it is OK for you, please merge it ;)

[kalinkrustev]

There is an extra semicolon here https://github.com/primefaces/primereact/blob/master/components/lib/dropdown/Dropdown.js#L621
It ends up in the rendered markup.
It came via 8da4b22.

[melloware]

let me fix and make sure prettier isn't adding that!

[melloware]

@kalinkrustev fixed! Thanks for reporting.