New API added to referential integrity to allow for row level annotation

[rdsharma26]

Issue #, if available:

• No associated issue. This is a WIP experimental utility.

Description of changes:

• The provided primary data frame will have a column added to it to indicate a true/false value.
• The value will be true if the values of the provided columns for that row exist in the reference dataframe. Otherwise, the value will be false.
• Added various tests, including tests for nested columns.
• Refactored the parameter validation from the regular row level check, so that the same validation can be done in the new function as well.
• Updated scaladoc of the two APIs.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[eycho-am]

Would it be possible to also add tests in the VerificationSuiteTests to see how the row level results for ref integrity are added with other row level results?

[rdsharma26]

Would it be possible to also add tests in the VerificationSuiteTests to see how the row level results for ref integrity are added with other row level results?

This is a standalone utility and we are not using it in the VerificationSuite. Once the verification suite supports multiple dataframes, we will add this check and integrate the row level results.