Add methods to Key that populate existing ArrayByteSequence

[dlmarion]

In #4735 a method was added that populated an ArrayByteSequence with the data for the column visibility. A suggestion was made that like methods could be added for populating ArrayByteSequence with data for the row, family, and qualifier as well.

[ctubbsii]

@meatballspaghetti You might be interested in doing this one, since you're working on a related issue, #4745

[jkucera0]

I can look into this.