Add on or before and on or after datetime comparisons

[martinechtner]

Summary

Added DateTime helpers on_or_before? and on_or_after? based off this request https://discuss.rubyonrails.org/t/proposal-create-datetime-helpers-on-or-before-and-on-or-after/80410 which would allow a date or time to be compared to another date or time and determine if the date/time is the same or before or after.

Other Information

N/A

[martinechtner]

I don't believe the spec failures are related to the changes made in this PR.

[rafaelfranca]

Thank you for the pull request but I don't think this feature will be common enough to justify the inclusion to the framework. And sorry for the delay on providing this feedback.