Add version compare lib/func

[jeffwubj]

Describe the problem/challenge you have
I managed to get K8s version and store it in a variable, want to check whether there is some handy lib that can compare version

Describe the solution you'd like
maybe a new func from version module:

def compare_version (a, b):
  // return 1 if version a > b
  // return 0 if version a <= b
  // a could be v1.23.1
  // b could be v1.22.1
enf

Anything else you would like to add:
[Additional information that will assist in solving the issue.]

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[pivotaljohn]

A workaround (which can serve as a reference implementation):

https://github.com/pivotaljohn/tanzu-framework/blob/ac3165c8/pkg/v1/providers/ytt/lib/helpers.star#L349-L360

[pivotaljohn]

While there's some minor questions about naming and proper home of things (if someone's game, sparking a quick conversation on Slack might well resolve this), this would be a nice add to the ytt "standard library". 👍🏻