Microoptimizations on DateTimeParser - #2990

I have reduced the size of the DateTimeParser struct that is being copied when calling CreateDateTime

The reduced size of the JIT assembly can be seen here
(Remove : byte on the enum & change byte/ushort fields to int)
Works for both Framework and .NET 8

Optimized the time verification, hour is very likely to be different than 24, minute & seconds are less likely to be 0, so we can exit earlier out of the checks.

Reusing the start + 1 calculation in Parse2Digit saves one line of JIT assembly 😅

Optimized some benchmarks so they mainly test (de)serialization & added one for deserialization of dates.
Fixed some unit tests for da-DK culture.
Gitignore Rider files.

DateTimeParser haven't changed in 9 years, so these changes can be backported to the many versions used