feat: add division to column_operation and Div to OwnedColumn (#77)

# Rationale for this change
Division is needed in postprocessing hence we need to add it. Please
merge #70 before reviewing this PR or alternatively look at the latest
commit.
<!--
Why are you proposing this change? If this is already explained clearly
in the linked Jira ticket then this section is not needed.
Explaining clearly why changes are proposed helps reviewers understand
your changes and offer better suggestions for fixes.
-->

# What changes are included in this PR?
- add division to `column_operation`
- implement `Div` for `OwnedColumn`
<!--
There is no need to duplicate the description in the ticket here but it
is sometimes worth providing a summary of the individual changes in this
PR.
-->

# Are these changes tested?
Yes.
<!--
We typically require tests for all PRs in order to:
1. Prevent the code from being accidentally broken by subsequent changes
2. Serve as another way to document the expected behavior of the code

If tests are not included in your PR, please explain why (for example,
are they covered by existing tests)?
-->

Author: iajoiner