Speed up query performance of Santa extension

[Mike Myers]

Implement a performance speedup on the new santa_allowed table using the constraints feature, such that the santa_allowed table can be queried faster using WHERE clauses.

Example:
https://github.com/facebook/osquery/blob/master/osquery/tables/system/darwin/signature.mm#L252

Reference:
https://osquery.readthedocs.io/en/stable/development/creating-tables/