[Postman Support]: Feature request: define values for placeholders in the yaml configuration

[networkinss]

Usually you don't have a Spring context in the JUnit tests.
I would like to have placeholders which can be defined programmatically.

Like you define in the yaml file:
apiExecutor[0].outputDir: ${file.path}

And define the value for the Idaithalam executor like in a Hashmap:
VirtualanTestPlanExecutor.setValues(HashMap map);

That will help a lot if you have several configuration files containing same values.
I can make a PR for that if that is ok.

[elans3]

@networkinss Please create the PR and we will review