[JENKINS-60721] Annotate parameter classes (#4439)

* Annotate and fix Parameter functions

Signed-off-by: Raihaan Shouhell <raihaan.shouhell@autodesk.com>

* Add checkfornull annotation

* Add test for issue

Signed-off-by: Raihaan Shouhell <raihaan.shouhell@autodesk.com>

* Fix test

* Previous ctor was private d'oh

* Fix annotation

* Prevent parameter names from being null

* Add comment about check