Expression for truncating + ellipsizing text

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**Is your feature request related to a problem? Please describe.**

Sometimes my database's field values have long text. When I create a table and add it to a dashboard, these long values cause the dashboard table columns to become very wide, requiring horizontal scrolling in order to see other columns. I'd like to trim down the fields to a shorter length, and know that they've been trimmed (by adding an ellipsis at the end of trimmed text).

**Describe the solution you'd like**

A simple expression that takes the string to ellipsize and the maximum length, e.g. `ellipsize(text, length)`.

**Describe alternatives you've considered**

I can implement this now using existing expressions — `case(length([Title]) > 50, concat(substring([Title], 0, 50), "…"), [Title])` — but it would be handy to have a simpler expression to express that.

**How important is this feature to you?**

Not critical, just a small usability improvement.

:arrow_down: Please click the :+1: reaction instead of leaving a `+1` or `update?` comment

The issue names no file, test, or entry point. Start by locating the existing expression implementations and their tests, then trace how expressions are used in dashboard tables. Done means a simpler expression can shorten long text to a requested maximum and visibly mark trimmed values with an ellipsis.

Written by the indexing model from the issue text.