Split out the zstandard change with history.

[rebrowning]

Looks like as part of the rebase to update the branch it added my name as well, but the complete history should be there now.

splitting out the zstandard work done by @guzzijones in https://github.com/StackStorm/st2/pull/5995

If we would rather just have the original PR go through, lmk and I can close this. But I saw a comment on his PR that it'd be nice to split the two out.

All credit for work on this goes to @guzzijones , I'm splitting it out with the hope of moving it through so we can mitigate the document size errors.