Add convenience types for DynamicTableWriter

[jjbrosnan]

Using DynamicTableWriter requires an import of the following:

"io.deephaven.db.v2.utils.DynamicTableWriter"

Also, in Python, when telling DynamicTableWriter what types to expect for each column, they require the types from deephaven.jpy:

tableWriter = DynamicTableWriter(["Column1", "Column2", "Column3"], [jpy.get_type("int"), jpy.get_type("java.lang.String"), jpy.get_type(...)])

Doing this feels clunky. The user experience could use improvement. For instance, in Python, I'd like to not have to call jpy.get_type() for each column. The code would get ugly fast if you want to use a DynamicTableWriter to create a ticking table with more than just a few columns. Adding convenience types there would greatly increase code readability.