Use input values in calculated measures

**Is your feature request related to a problem? Please describe.**
I would like to use one or more user inputs in calculated measures. This will allow me to implement what-if scenarios. For example, if I have insurance liability data and evaluate liability by various dimensions based on the probability of an event occurring (e.g. earthquake), users may input a probability in percentage and measures should recalculated using this value in real-time.

**Describe the solution you'd like**
1. Ability to pass custom parameters in query
2. Availability of these parameters in server side so that they can be referenced in measure formula

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
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