Add the cherry-pick script as a hack command

[knanao]

What this PR does / why we need it:
This is a command for core contributors in order to cherry-pick bug fixes to a release branch.

Prerequisites

• The release branch exists. (ex. release-0.1)
• The pull request to cherry-pick was already merged.
• (optional) If you push commits and create a pull request, gh is needed to be installed and ran gh auth login.
  Please refer to gh-cli.

Usage

$ hack/cherry-pick.sh -qc $RELEASE_BRANCH $PULL_REQUEST_NUMBER...

Example

$ hack/cherry-pick.sh -qc release-0.35 3808

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[nghialv]

gh was already installed and ran gh auth login. Please refer to gh-cli.

I know that gh is needed to create a new PR via CLI but I feel that this requirement could reduce our flexibility.
🤔

[knanao]

@nghialv
I feel your points too.
So how about making it an option to create a pull request, or we'll try it once anyway?

[nghialv]

how about making it an option to create a pull request

Nice idea. Making it as an option is a better way. 👍

[knanao]

@nghialv
Thank you for your reviews.
I fixed some points, so please check it again.

[khanhtc1202]

🚀

[nghialv]

Great!