Improve expressions to completely support `NULL` constants

[WinkerDu]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Since DF has a real NULL support from #2364 , based on this pr, I'd like to file a ticket to track this trivial literal NULL supports for DF expressions.

• Add proper support for null literal by introducing ScalarValue::Null #2364
• Adds unit test cases of mathematical expressions working with null literal #2478
• Numeric, String, Boolean comparisons with literal NULL #2482
• Add, Minus, Multiply, divide, Modulo operator work with literal NULL #2609
• Like, NotLike expressions work with literal NULL #2626
• Date, Timestemp comparisons with literal NULL
• Between expression works with literal NULL
• Regex expressions work with literal NULL

Additional context
This issue is based on #1184, thanks @alamb