make send-request and compute accept plain json

this MR make the send-request and compute commands accept plain yaml or json data, i.e. you can now do something like

python -m my_backend_module compute '{func_name: "version_info"}'

and

python -m my_backend_module send-request '{func_name: "version_info"}'

as well as

python -m my_backend_module send-request some_request_in_a_file.yaml
python -m my_backend_module compute some_request_in_a_file.yaml

assigned to @Chilipp

added 1 commit

• 1ed74a5c - update docs

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enabled an automatic merge when all merge checks for 1ed74a5c pass

merged

mentioned in commit 20a5595d