Connectivity metrics: add transports pretty printing

This patch also
  - partially reverts commit f927f0c52e7df5b057e7d28888c3cfed164d241a
    that exposed a getTransports method on NetworkCapabilities.
  - moves enumerateBits to BitUtils (as unpackBits), and adds the
    reverse packBit method.

Bug: 34901696
Test: manually looked at $ adb shell dumpsys connmetrics list
Change-Id: I1650daf8fc9c1b6e0d986d2285f81e888be8847f
Merged-In: Id04f9080e7f75608deeb49306aec34941e71794c

(cherry picked from commit df456e13a1127e3c8594b1d22ea4a9b3dca67a4b)
5 files changed