Implement Strict mode errors for Comparison ops (<, >, <=, >=) and BETWEEN

[jpschorr]

Tasks:

• Add conformance tests for comparison ops in strict mode
• Add conformance tests for BETWEEN in strict mode
• Implement strict mode errors for comparison ops and BETWEEN #506

These comparison ops (<, >, <=, >=) have different behavior than the equality ops (=, <>) in strict mode. The equality ops should never error in strict mode and never return missing in permissive mode. While the comparison ops should return an error on non-comparable types and return missing in permissive mode.

Perhaps this could be a separate effort/issue to

• add conformance tests for this behavior
• fix this implementation

Originally posted by @alancai98 in #413 (comment)

Similar to comparison ops,BETWEEN should fail type check if t1 is not comparable to t2 or t1 is not comparable to t3 (thus resulting in an error in strict mode, missing in permissive mode). Perhaps can track as separate effort to fix and add conformance tests.

Originally posted by @alancai98 in #413 (comment)