Implement a convenient keyword for creating variables for process instance

Now

Creating variables for a process holds a lot boiler plate code:

*** Task ***
Demo of starting process
    ${variable1}    Create Dictionary    value=My first value    type=String
    ${variable2}    Create Dictionary    value=My second value    type=String
    ${variables}    Create Dictionary    variable1=${variable1}    variable2=${variable2}

    start process    my_favorite_process    ${variables}

Vision

It should be much easier like for instance:

*** Task ***
Demo of starting process
    ${variables}    Create Dictionary    variable1=My first value    variable2=My second value

    start process    my_favorite_process    ${variables}

Possible solution:

1. Maybe Camunda does the typing for you and you don't need to define type=String in each dictionary
2. The underlying inofficial python client for external tasks has some functions for wrapping variables. Maybe we can facilitate that.
3. Maybe we can make use of the python client generated from openapi specification (#6 (closed) )