[TFLite] Quantized unary elemwise ops

[leeexyz]

Hi All,

I am using TFLite frontend to parse some nets, but hit the unsupported quantized exp.

Apparently, it supports the quantized unary element-wise operators. I found this tracking issue and then I deleted the assert and re-orginized the tests accordingly. (ceil, floor, round, exp, log, tan, cos).

I also found the version check here that is not correct. I cannot find the exact version, so I just leave it where it is. In addition, for tan, it still failed in the test.

[lhutton1]

Thanks @leeexyz! cc @leandron who created the tracking issue

[leandron]

LGTM - Thanks for adding this @leeexyz!