[GWP-ASan] Enable debuggerd to pull more allocation metadata.

With the addition of runtime-configurable GWP-ASan, there might be many,
many more than 1,000 allocations. Have support for them, but keep a
hopefully-won't-crash-the-device limit.

Bug: 219651032
Test: atest bionic-unit-tests

Change-Id: I7b8e2bf5ab7c723ab6c61365f0dc610e400dbbce