[NUI] Fix a build warning CA1717 (#2422)

[NUI] Fix a build warning CA1717 (#2422)

- Only FlagsAttribute enums should have plural names
 https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1717

- Some enums cannot be fixed because they're already public APIs,
 so added suppress messages for CA1717 build warning.
- Some enums are already used as hidden APIs,
 so added Obsolete tags and made a fixed version as singular name.
- Tizen.NUI.Components.ControlStates enum should be marked with the FlagsAttribute.

Signed-off-by: Seoyeon Kim <seoyeon2.kim@samsung.com>
Co-authored-by: Jiyun Yang <ji.yang@samsung.com>