Add more detail to rosalloc fragmentation OOME

Also include total number of free page bytes, space footprint, and
space max capacity.

Sample output:
Throwing OutOfMemoryError "Failed to allocate a 7012 byte allocation
with 103464 free bytes and 101KB until OOM; failed due to
fragmentation (required continguous free 8192 bytes, largest
contiguous free 4096 bytes, total free pages 4096 bytes, space
footprint 268435456 bytes, space max capacity 268435456 bytes)

Added a basic test to ensure the allocator coalesces properly.

Bug: 32997082

Test: test-art-host

Change-Id: I642b6ad34b98f6d98c10f242a6f6e926e0b42acc