c7n - ValueFilter - add value_type: number

[jomalsan]

I am working on a policy that returns a version in the format '1.X' and need to check if the version is less than 1.2. Currently the only value_type option for converting to numeric is integer which floors all of the version numbers to 1 so that they all pass the filter.

Feature request is for a new value_type option, number or float, that will support converting strings to floating point numbers.

[thisisshi]

A semver value_type could probably work here,

https://github.com/pypa/packaging

from packaging import version

low = version.parse('0.1.0')
high = version.parse('0.1.1')

assert low < high

[stefangordon]

Yeah it might make sense to just add both a float and a semver.