Add fuzzers for 10 libosi components

Added fuzzers, most of which may be run either on host or on device.
Note that coverage will differ based on arch. Additionally, alarm
will not successfully run on host due to the reliance on hooking
system functions, and compat may not be useful on-device, as libosi's
compat.h function definitions, and therefore the fuzzer calls, are
wrapped in an '#if __GLIBC__'.

Test: Tested on a Pixel 3a with no starting corpus and a short run,
      resulting in the following statistics:
          - alarm                   15% cov     ~280  exec/s
          - allocation_tracker:     61% cov     ~2.5k exec/s
          - allocator:              34% cov     ~24k  exec/s
          - array:                  22% cov     ~16k  exec/s
          - buffer:                 22% cov     ~26k  exec/s
          - compat:                 N/A         N/A
          - fixed_queue:            45% cov     ~8k   exec/s
          - future                  22% cov     ~83k  exec/s
          - list                    46% cov     ~21k  exec/s
          - ringbuffer              38% cov     ~20k  exec/s

Signed-off-by: Michael Ensing <michael.ensing@leviathansecurity.com>
Change-Id: I9203c804941beaa470940452f39bf352d725eb02

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