Grapify system hooks API

What does this MR do?

Add the Grape-DSL to the system-hook API.

What are the relevant issue numbers?

Related to #22928 (moved)

@zj Could you take a first look on this MR?

Added 1 commit:

• b74f3aec - Grapify system hooks API

@zj I fixed all the stuff. Would you mind to take a look again before I pass it to @rymai

Thanks for the help! Had a couple of minor nitpicks, but other than that: this looks good to me! :)

Added 1 commit:

• e836b904 - Grapify system hooks API

Added 1 commit:

• c13041df - 1 commit from branch master

Resolved all discussions

Passing to @rymai :)

Reassigned to @rymai

Mentioned in issue #22928 (moved)

Mentioned in issue #23335 (closed)