Fix treatment of Vec of Analog and Vec of Bundle of Analog (#1091)

* IO(Analog) fixed for RawModule

* Add a Analog Port for RawModule test & spec

* Fixes around Module instantiation and ports in AnalogPortRawModuleTest

* Shorten Comment

* Add Data.isSynthesizable to distinguish SampleElementBinding

This helps clarify the notion of being bound but not hardware.
Data.topBindingOpt is now used to get the *actual* top binding,
including across SampleElements (eg. in Analog checking that the top is
bound to a Port or a Wire)

* Fix pretty printing for Vec

* Refactor tests for Vec of Analog, add test for Vec of Bundle of Analog