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* Add custom target to bundle examples together

* Add int4 example conditionally (just copy from int8 example)

* Extract common code into common.hpp

* Move ref gemm type alias into data-type-specific sources

* Add #error directive to prevent compile with wrong setting

* Let AddAddFastGelu support int4 parameter type

* Let check_err() support int4 parameter type

* Add wrapper function to hide value conversion while copying memory

* Finish int4 example for GEMM + AddAddFastGelu

* Add new DeviceMem API to copy memory

* Use new DeviceMem API to implement examples

* Fix wrongly use of macro 'CK_EXPERIMENTAL_BIT_INT_EXTENSION_INT4'

* Revert "Add new DeviceMem API to copy memory"

This reverts commit e26e7af71e1f982a4ca7406401e2fc9b1f086b32.

* Add conversion ctor for Tensor<>

* Add 'const' specifier to Tensor<>::CopyAsType()

* Convert Tensor<> values before/after transfer between host & device