[FEATURE]: Create is_null, is_empty and is_null_or_empty checks

[STEFANOVIVAS]

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Problem statement

Sometimes, we need specific columns to be null or empty to meet certain business rules. The only way DQX could let us do it would be with the is_equal_to check, but the argument "value" doesn't support None type. The set of checks is_not_null,_is_not_empty and is_not_null_or_empty doesn't have the "negate" argument.

Proposed Solution

Create a set of checks called is_null, is_empty, and is_null_or_empty to allow checks that confirm whether a given column is null, empty, or both.

Additional Context

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