* bulk change `type T` to `type *T*` in spec
* update all `T` which referee to type to use *T* pattern
* get back with `T` where T is dimension
* fix *T*1 -> *T1*
* Make italic types where was no formating
* Review Split operation class
* Added node validation checks
* Added type_prop unit tests with invalid cases and negative axis value
* Add ngraph check for host tensor inputs and outputs
* Enable CPU backend tests
* Add serialization single layer tests
* Add more precisions, axis and num of splits in single layer tests
* Add op to script of trusted operations
* Fix check macro for inputs and outputs in evaluate method
* Fix comparison of integer expressions of different signedness compilation error
* Add validation check for upper bound dimension for dynamic shapes
* Add node validation check for num_splits attribute greater than zero
* Align spec with num_splits attribute range of values
* Review spec of Split operation
* Address review comments
* Changed detailed description
* Added more description for attribute
* Changed T1 and T2 for T and T_AXIS
* Changed range of values in axis input description
