[MTE] Print cause and alloc/dealloc traces to logcat.

This information clearly meets the bar for being dumped to logcat. If we
omit the info, we may confuse the user into thinking that it's not
available at all, especially if it's their first time seeing an MTE
report.

This also adds some functionality to the integration testing library to
pull logcat messages and scan them to make sure the contents are in both
places.

Bug: 187881237
Test: atest debuggerd_test # on QEMU w/ MTE.
Change-Id: Icc17ea45bda7628331cc4812eaad3bc5c949b7a7