fix: Table stat values should always be represented with a string

[AndrewCiambrone]

Signed-off-by: Andrew andrjc4@vt.edu

Summary of Changes

This change makes it so all stat values are casted with a string. In the past there was some inconsistencies on if this should be a integer value or a string value. This change here makes it so its consistently treated as a string.

Tests

Modified the table stats test so it expects a string.

Documentation

What documentation did you add or modify and why? Add any relevant links then remove this line

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[feng-tao]

cc @allisonsuarez WDYT?

[dikshathakur3119]

if we have list of values for a column stat,e.g distinct values or most common values in a column, how do we want handle that? Concat all values to create a single str?

[AndrewCiambrone]

Yeah I would think a list would be concatenate to a single string. I think that is how it would be displayed on the front end?

[feng-tao]

@dikshathakur3119 I think a concatenation of list of string should work for you.