Table expressions do not support underscores as numeric separators in numeric literals

[ghing]

JavaScript now supports underscores as separators in numeric literals, however, Arquero table expressions do not support this.

Replication code:

let dt = aq.table({
  'col1': [1_000, 2_001, 3_123],
});
dt = dt.derive({
  col1_gt_2k: d => d.col1 > 2_000
});

Expected result:

dt has the same value as if the code execute was:

dt = dt.derive({
  col1_gt_2k: d => d.col1 > 2000
})

Observed result:

The following error is thrown:

Error: Expression parse error: d => d.col1 > 2_000