feat: Add column_display_names to ui.table

[mattrunyon]

Fixes #653. Adds column_display_names prop to ui.table which allows users to rename a column for display purposes. The original column name is still shown in column statistics. The column widths should be initially sized based on the display name.

Can test with this Python

from deephaven import ui
import deephaven.plot.express as dx

t = ui.table(
    dx.data.stocks(),
    column_display_names={
        "Price": "Price (USD)",
        "Side": "Buy/Sell"
    }
)

[bmingles]

LGTM. Verified the mapping with provided script.