Support non-metric based assertions

[popcornylu]

Summary

Currently, the assertion rules are all based on the profiling result. However, it is not enough as a data quality tool. There are some assertion can not work by profiling

1. Format check: The text column match certain criteria.
2. Column values in set: The value of the column should be only valid in certain set.
3. Reference check: Like foreign key constraint in db. Check if value in a column exist in another table's certain column

Intended Outcome

1. Add at least 3 non-metric based test
2. Design the foundation of non-metric assertions.

How will it work?

1. Run SQL query rather than validate the value from profiling result.