RCOCOA-1874: Add support for lexicographical comparison for string queries

[dianaafanador3]

Added support for string comparison queries, which allows building string
queries with the following operators (>, >=, <, <=).
(#8008).

[leemaguire]

LGTM

[tgoyne]

This is silently ignoring case-insensitive modifiers on comparison operators (e.g. a >[c] b).

You appear to have modified the generated test files directly rather than modify the template files.

[dianaafanador3]

This is silently ignoring case-insensitive modifiers on comparison operators (e.g. a >[c] b).

You appear to have modified the generated test files directly rather than modify the template files.

Case sensitive operations are not supported for >, >=, <, <= operators in core, the only things is to throw an error if this modifiers is added when using a NSPredicate query, unless I'm missing something.
From my understanding, lexicographical comparison is already "case sensitive" because it takes into account the weight of the character (which is different for lower case and upper case characters), I don't think we can make case insensitive lexicographical comparison

[tgoyne]

I don't think we should support case-insensitive comparisons, but we need to report an error rather than silently doing the wrong thing.

[dianaafanador3]

@tgoyne solved comments