New redact_values Remap function

[binarylogic]

Blocked in #5785. Like #5783, but for the redact function.

Example

Given this event:

{
	"parent": {
		"child": "222"
	}
}

And this Remap expression:

replace_values('foo', 'bar')

Or

replace_values(/foo/, 'bar')

The following event would be produced:

{
	"parent": {
		"child": "bar"
	}
}

[jszwedko]

Closing since this is supported by VRL iteration now.