Add "Table Last Modified" to table view, esp. on PostgreSQL

**Is your feature request related to a problem? Please describe.**
I always wish I could see when the last commit was to a specific table in a PostgreSQL database.

**Describe the solution you'd like**
I'd like to see an always-read-only field that shows the last time the table was edited.

Could also add a first-edit and a pct null edit date value.

**Describe alternatives you've considered**
Currently, the only option is to run a query like this:

```sql
SELECT max(pg_xact_commit_timestamp(xmin)) FROM schema_name.table_name;

-- or --

SELECT pg_xact_commit_timestamp(xmin), * FROM schema_name.table_name;
```

**Additional context**
It might be good to add a hovertip or link to docs on how to enable this feature in the PostgreSQL database. On AWS PostgreSQL, it's disabled by default.