[Enhancement] Expose more details of a method signature through Reflection

[disarray2077]

• IsPublic, IsPrivate, etc... Actually, this can be done by accessing directly the MethodFlags, but this results in an error during Comptime.
• IsStatic, IsVirtual, IsAbstract, etc... As above, this can also be done by accessing directly the MethodFlags, but this also doesn't work during Comptime.
• IsParams Example: AppendF(StringView format, *params* Object[] args)