schema: add first json schema for method parameters

this version is only focused on method parameters
embedded objects and return values will be part
of the next patches.

Change-Id: I5a4416ecbb15b446f88426f95bd59de249deed54
Signed-off-by: Boris Glimcher <Boris.Glimcher@emc.com>
Reviewed-on: https://review.spdk.io/c/spdk/spdk/+/26470


Reviewed-by: Konrad Sztyber <ksztyber@nvidia.com>
Tested-by: SPDK Automated Test System <spdkbot@gmail.com>
Reviewed-by: Tomasz Zawadzki <tomasz@tzawadzki.com>
Reviewed-by: Ben Walker <ben@nvidia.com>