Add traceNameV2 for backwards compat. of traceName (#2784) (#2786)

Add utilities to enable backwards compatibility of the Trace.traceName
API to Chisel 3.5.x.  This adds a Trace.traceNameV2 utility which
aliases to Trace.traceName.  This also removes the TraceNameAnnotation
and renames it TraceAnnotation.  In 3.5.x, traceName will point at
TraceNameAnnotation (which has don't touch behavior) and will be
deprecated telling people to use traceNameV2 which will point at
TraceAnnotation (which does not have don't touch behavior).  This will
require fixups to the backport associated with this PR.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>
(cherry picked from commit 47b7227e

)

# Conflicts:
#	core/src/main/scala/chisel3/experimental/Trace.scala

Co-authored-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>