Extract helper to format values in attr table

[jonallured]

Prior to this PR the formatting of values in the attr tables used in the CRUD pages section were spread out into the various models. For example, any timestamps would be formatted in the model file with a call to .to_fs and if there was a value that could be nil then I had to use the safe navigation operator. This was silly!

What this PR does is extract a helper method called attr_table_value that takes the value and then applies this logic:

• if it is nil then return NIL
• if it is a date or time then call to_fs on it
• if it is an integer then format it with commas
• otherwise just return the value

This really cleaned things up and relocated the formatting to the view layer rather than the model layer. It also gives me a single place to change these things should I so desire. Foreshadowing!