Add support for nesting dynamic parameters in designer

[siddharth-ms]

We have a scenario where we want to allow customers using SAP connector to pass input in multiple formats. Eg: JSON, XML, Custom

Today we only support XML. We would like to introduce JSON and Custom input.

In Custom input:

1. The customer will select inputBodyType as Custom.
2. Which will introduce a new required parameter rfcName.
3. Which again introduces new parameters based on what input the given rfcName needs.

To support this we cannot have a dynamic parameter (here rfcName) introduce another dynamic parameter(parameters that appear based on rfcName).
We would like to support those scenarios. Where we nested dynamic parameters are allowed. A demo screenshot with number indicating order of introduction of those parameters is shown below: