Feature Request: Cannot merge array inputs

[0xThemis]

At the moment, we can only merge inputs from multiple parties if it is a dedicated named input. If a circuit has inputs like:

signal input in[2];

it is not possible to provide the array from different parties

• [ ] Implementation
• [ ] Docs example

[dkales]

Use "?" as placeholder for other parties.

[dkales]

@fabian1409 is this done?

[fabian1409]

@fabian1409 is this done?

will implement this next week