Query: add translation for string.Compare for Cosmos

[maumar]

both instance and static version

[ajcvickers]

@AndriySvyryd Can't find a duplicate that contains this.

[AndriySvyryd]

#16143, but we can keep this one separate

[yosoyhabacuc]

Hi, I was thinking on translating this function by using string1>string2 comparison in Cosmos, as there is not Compare equivalent function, but we could get the same result by just using > and <. Therefore the basic comparison cold be translated, and also the overloads with starting positions.
For overloads with case sensitiveness , we could use UPPER to ignore casing, although it could create create performance issues as it doesn't use the indexes (https://docs.microsoft.com/lv-lv/azure/cosmos-db/sql/sql-query-upper),
Other overloads including CompareOptions, CultureInfo and StringComparisson would not be translated.
What do you think of the proposal? @ajcvickers @maumar

[roji]

We could indeed translate .NET string.Compare(a, b) > 0 to a > b in Cosmos (and similar).

I agree that we should avoid translating overloads accepting StringComparison, if the only way to implement those would be to use UPPER, negating index use - we've discussed this thoroughly in the context of relational databases, and I think the logic here is the same. Note #25250, which discusses translating Contains, including case-insensitivity, which apparently can be done with Cosmos CONTAINS while maintaining index usage.