gpu: nvidia: Refactor to native parameters for matmul

[ShanoToni]

Description

This refactor is required to address current issues in nvidia backend matmul. Currently the use of runtime dimensions requires native-specific member objects to be initialised, which are specific to the dimensions (Tensor descriptors, matrix layouts). This is handled currently by cleaning up the members and re-initializing on execution. This is not thread safe.

The refactor proposes abstraction of the members to separate structs, which in the non-runtime dimension case would be initialised with the primitive descriptor and passed to the primitive on its respective creation. When not using runtime dimensions the parameters are cleaned up when the primitive is destroyed.

In the runtime dimension case, the parameters are initialised only with the non native specific members. Inside the execute call a copy is created of the new params struct and only then are the native specific structs initialised for the copy. When using runtime dimensions the params are cleaned up at the end of the host_task running the matmul.

Checklist

General

• [ x ] Do all unit and benchdnn tests (make test and make test_benchdnn_*) pass locally for each commit?
• [ x ] Have you formatted the code using clang-format?