[New Feature] Adding Mediator Level Try-Out Functionality

[thuva9872]

Description:
This feature allows the users to test the mediators during the development phase, which will be very useful as the users will be aware of each mediators during the development phase itself.

Describe your problem(s)
The developers must repeatedly build and deploy the integration to verify its correctness due to the lack of straightforward way to test and validate the mediator behavior during the development.

[thuva9872]

The ETA for this feature is as follows,

Best Case Estimate: 2024-10-25
Most Likely Estimate: 2024-10-31
Worst Case Estimate: 2024-11-15

[thuva9872]

In the initial discussion, we outlined the following:

1. We plan to support all mediators, except the deprecated ones.
2. The user flow will be as follows:
   1. The user provides the input payload at the start node of the mediation diagram.

2. The input and output for each mediator will be processed by the MI runtime and displayed to the user for review.