Add "packageManager" field in package.json for corepack

[zetavg]

For developers with Corepack enabled, the "packageManager" field in package.json will be used by Corepack to automatically determine which version of the package manager should be used for the current project.

https://nodejs.org/docs/latest-v20.x/api/packages.html#packagemanager

Background

When developers with Corepack enabled run the yarn command, the "packageManager" field in the root package.json will be automatically added with the following message shown:

! The local project doesn't define a 'packageManager' field. Corepack will now add one referencing yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e.
! For more details about this field, consult the documentation at https://nodejs.org/api/packages.html#packagemanager

1.22.22

...while this might not be ideal since it'll make the git working tree dirty.