[Topk_v2 Op] support other operation types (#1314)

[Topk_v2 Op] support other operation types (#1314)

* [Topk_v2 Op] add uint8 types

This commit adds other types.
-uint8

Signed-off-by: SungJin Choi <lotieye.choi@samsung.com>
* [Topk_v2 Op] add int32 operation types

This commit adds other types.
-int32

Signed-off-by: SungJin Choi <lotieye.choi@samsung.com>
* [Topk_v2 Op] add an comment that explains topk_v2 operation

This commit adds comments.
- TopK_v2 of NN Runtime supports TENSOR_FLOAT32, TENSOR_QUANT8_ASYMM, TENSOR_INT32 other than TFLite.

Signed-off-by: SungJin Choi <lotieye.choi@samsung.com>
* [Top[Topk_v2 Op] add 2D test cases for other types

This commit adds 2D test cases for other types (int32, uint8)

Signed-off-by: SungJin Choi <lotieye.choi@samsung.com>