Conditional inputs elsa 3

[af-git-64]

This pull request adds the necessary input attributes classes for elsa-workflows/elsa-studio#186.

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This change is 

[af-git-64]

dotnet

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[LukasBenner]

What is the progress here?

[LukasBenner]

@sfmskywalker can someone give me an update on why no one ever took a look at this?
Should I take a look at it?

IMHO not having the ability to make an input depend on another input is really bad.
Selecting hierarchical / nested properties is not possible.

[sfmskywalker]

Hi @LukasBenner , thanks for taking an interest. As is the case with any issue and PR, it's a function of competing priorities and limited bandwidth.

I agree, having a convenient way to setup cascading input is important. It can be done without changing Elsa Studio as an add-on module, but it would be better if it were a built-in feature.

Please feel free to take a look, it'd be great to get your review.

[LukasBenner]

@af-git-64 just asking out of curiosity:
Why did you serialize all the new properties into the Description attribute?
@sfmskywalker what is the intended use of the Description attribute?

[LukasBenner]

@sfmskywalker I did take a look at this PR and decided to further refine the implementation.
I craeted a separate PR #6410 that uses new properties for the new functionality.