mesh: shell: Convert hb-pub-set command to hb-pub
mesh: shell: Convert hb-pub-set command to hb-pub

Convert the hb-pub-set command to a more generic hb-pub that can be
used both for getting and setting the Heartrate Publication State.

X-Original-Commit: 0ad543c7485de6e296c2b28059f898fd66b53a71

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble