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Adds compute_method for the experimental custom ops.
Adds a test for the same using HIP APIs.
Depends on #1183
Solves #1101

Updated each source file in the repo with the existing license.

Designed to allow a user to format the values needed for the json_string: migraphx::operation("reduce_mean", "{axes : [%i, %i, %i, %i]}", axes[0], axes[1], axes[2], axes[3]) instead of needing to use string concat or stringstream

* code backup

* clang format

* add the python api for op construction

* clang format

* add converting a json string to a value and then pass to make_op

* fix a build error

* support kwargs decoder

* clang format

* code backup

* clang format

* temp code backup

* clang format

* temp code backup

* convert input string to the json format

* clang format

* remove unnecessary code

* fix review comments

* clang format

* add a comment

* add unit tests

* clang format

* fix cppcheck error

* fix review comments

* clang format

* rename two files

* refine an error report

* clang format

* remove unnecessary code

* fix a review comments

* add convert_to_json unit tests

* clang format

* fix cppcheck error

* fix cppcheck error

* add more unit tests

* clang format

* fix clang tidy error

* clang format

* fixed an test failure

* fix cppcheck error

* fix a bug

* fix cppcheck error

* fix jenkins build error

* fix a jenkin build error by wrap up string

* clang format

* another try

* clang format

* fix jenkins build error

* clang format

* remove unnecessary code

* fix review comments

* fix cppcheck error

* fix review comments
Co-authored-by: Paul Fultz II <pfultz2@yahoo.com>