* Update the spec
* add unit-tests
* add avgPool unit-tests to CMakelist
* Remove second constructor and change the first one to take default values for rounding_type and pad_type
* add type_prop test for default values
* add 5d input single layer test instances
* add type_prop tests
* Require input to be 4D or 5D
* add validation check for pads size
* Update few tests to take 5D input instead of 6D
* Update validate_and_infer_types method
* Update infer_batched_pooling_forward and try_apply_auto_padding methods
* Update auto_padding_spatial_dims_dynamic type_prop test for binary_conv, conv, deformable_conv, group_conv and max_pool
* style-apply
* add validation check for kernel size
* add xfail for avgpool python backend test
* style-apply
* remove avgpool backend test from xfail list
* Update spec
* Allow the 3D input
* Update type_prop test with 3D input
* style-apply
* Remove xfail_issue_38709
* fix typo
* Update spec
* Update outputs section in spec
* Update spec
* fix typo
* clean file
* Update detailed description and fix xml examples
* fix exclude-type typo
* fix typo in outputs section
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