Get existing parameters of a job

### What feature do you want to see added?

We should add a method that can get us the job parameters directly without using the last build or by parsing the XML.
This will be helpful for the first build where there is no last build yet. Or if the developer does not want to get them via the XML.

### Upstream changes

No upstream changes are needed for this. We may need to add a new method that can support this functionality.

### Are you interested in contributing this feature?

Yes