Add modulePorts and fullModulePorts in DataMirror for Instance (backport #4076) (#4077)

* Add modulePorts and fullModulePorts in DataMirror for Instance (#4076)

(cherry picked from commit 62bbad55

)

# Conflicts:
#	core/src/main/scala/chisel3/reflect/DataMirror.scala
#	src/test/scala/chiselTests/reflect/DataMirrorSpec.scala

* Resolve backport conflicts

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Co-authored-by: Deborah Soung <debs@sifive.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>