feat: add `column_repetition_operation` in preparation for joins

[iajoiner]

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• [x] The PR title and commit messages adhere to guidelines here: https://github.com/spaceandtimelabs/sxt-proof-of-sql/blob/main/CONTRIBUTING.md. In particular ! is used if and only if at least one breaking change has been introduced.
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Rationale for this change

In order to perform joins we need to be prepared to repeat a column or a segment of it either element-wise or in its entirety. Here we will add the utils that help us achieve both.

What changes are included in this PR?

• add repeat_slice and repeat_elementwise
• add RepetitionOp, ColumnRepeatOp and ElementwiseRepeatOp

  Yes.

[github-actions[bot]]

:tada: This PR is included in version 0.49.2 :tada:

The release is available on GitHub release

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