isContainedIn Check breaks for columns with special characters

[malcolmgreaves]

The isContainedIn Checks will fail whenever there exists at least one column with a special character. Here, a special character means something that is reserved in the Spark SQL language: e.g. a [ or ]. isContainedIn generates SQL, but the column name is not properly escaped. This means that, at execution time, the generated SQL will fail with a syntax error. As a consequence, this syntax error will cascade through all other Checks when associated with a VerificationRunBuilder. Thus, even valid Checks will fail due to this SQL syntax error.