[NUI] Fix Dispose warning error[CA1001] (#2130)

[NUI] Fix Dispose warning error[CA1001] (#2130)

* [NUI] Fix DisposeQueue warning error[CA1001]

CA100: Types that own disposable fields should be disposable
https://docs.microsoft.com/ko-kr/dotnet/fundamentals/code-analysis/quality-rules/ca1001

Signed-off-by: huiyu.eun <huiyu.eun@samsung.com>
* [NUI] Fix Accessibility build warnings

CA100: Types that own disposable fields should be disposable
https://docs.microsoft.com/ko-kr/dotnet/fundamentals/code-analysis/quality-rules/ca1001

Signed-off-by: huiyu.eun <huiyu.eun@samsung.com>
* [NUI] Fix build warnings- 1001

Signed-off-by: huiyu.eun <huiyu.eun@samsung.com>
* [NUI] Add destructor

Signed-off-by: huiyu.eun <huiyu.eun@samsung.com>
Co-authored-by: WonYoung Choi <wy80.choi@samsung.com>