Display Unique Values in Column Statistics

[cpwright]

Description

When hovering over the Column A, I expect to see a count of "a" and "b":

from deephaven import empty_table
et=empty_table(100).update("A=i%2==1?`b`:`a`")

Instead I just see the unique count.

But I would expect something like this:

Versions

• Deephaven: f4f1d2b8e77e233a41baffb094e1e19259582e47

[niloc132]

This is dependent on #188 to get proper deserialization of the values that the server wants to be able to send.