Provide relevant schema of pipeline serialization

[lohit8846]

Is your feature request related to a problem? Please describe. It's great that this library supports serializing the pipelines into a human editable format as that's a very useful feature that other packages do not have. However, I see an issue with the provided format

There is no defined schema for what fields each component needs to have set. This is important because otherwise a user purely editing the YAML will not know what fields are supported and we can't introduce any validation. I am also planning to use JSON format instead with a custom marshaller and provide a JSON schema which can be edited as a GUI since there are plenty of JSON Schema GUI editors other there. However, this requires me to manually inspect each component and come up with a JSON schema which would be a nightmare in terms of maintenance when components change

Describe the solution you'd like

I would like to propose that the haystack framework provide a way to generate a JSON schema for all the components that basically captures that input format which will allow us to validate and build on top. Is this possible in the current design?