Add converter for hardtanh similar to that of clamp

Had to add my owwn migraphx converter as the order of value return to clip would fail the test

Was breaking when trying to use elu converter for aten elu converter op

- Test for both non parameterize and parametertized for alpha/default values

Handle getting max value from input tensor.

Similar to the onnx reduce_min operator, implimentatin is similar to that of mean, max and map to similar reduce ops in MIGraphX.

This one is a freebie when doing max

Required if we want to support min() operator down the road.

Added converter for fx and dynamo in similar vein as the argmax function.

Also added unit tests

Updated unit tests as well

added changes to unit tests and fix operators to handle multi input args correctly.

- remove print in stack
- merge argmin argmax in testing
- rename test_leak_relu -> test_single_param_activation_funcs
- Add default for min dim=None