Support multiply(long, java.time.Duration)

[alexpeters1208]

This code block:

time_ops = empty_table(10).update(
    [
        "BaseTime = '2021-07-11T12:00:00.000Z'",
        "Timestamp = BaseTime + (ii * 'PT1h')"
    ]
)

Fails because multiply(long, java.time.Duration) is not implemented. There are a couple of alternatives:

time_ops = empty_table(10).update(
    [
        "BaseTime = '2021-07-11T12:00:00.000Z'",
        "Timestamp = BaseTime + 'PT1h'.multipliedBy(ii)"
    ]
)

or

time_ops = empty_table(10).update(
    [
        "BaseTime = '2021-07-11T12:00:00.000Z'",
        "Timestamp = BaseTime + (ii * HOUR)"
    ]
)

However, I think supporting multiply(long, java.time.Duration) is reasonable and well-defined.

[chipkent]

The same problem exists for both Period and Duration.

from deephaven import empty_table
t2 = empty_table(10).update(["P = 'P2D'", "D = 'PT2h'"])
t3 = t2.update("P2=P*2")
t4 = t2.update("D2 = D*2")