Add tablenumber capabilities to distinguish repeated image numbers from multiple datasets

[d33bs]

Description

This PR addresses #30 by adding a tablenumber by user specification or automatically when there are multiple datasets being parsed by CytoTable. I encountered #187 during implementation, which I feel is a complex issue we shouldn't solve in this PR.

Closes #30

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

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[d33bs]

Thanks for this review @gwaybio ! I'm going to merge this in after responding to your comments.