Update SearchCondition visitor with improvements from SQL Server version

[ChrisJollyAU]

Following from the SQL Server part of EF Core, there has been multiple improvements and optimizations set up in the SearchConditionConvertingExpressionVisitor

Update this with those improvements

2 main ones to point out are dotnet/efcore#23711. This changes code from <> TRUE to = FALSE in certain cases

There is also numerous improvements under the heading of dotnet/efcore#34001

This mostly encompasses nullable boolean expressions not returning null. Optimizations/fixes include using bitwise XOR instead of the normal CASE expression (or in Jet since we don't have that we use the IF...THEN)