Pyppd: fuzz_parse.py: add instrumentation

[mdimado]

added atheris.instrument_all() for instrumenting functions for the fuzz_parse fuzzer
increased coverage from: 0 to 136

before:

#2      INITED exec/s: 0 rss: 57Mb
WARNING: no interesting inputs were found so far. Is the code instrumented for coverage?
This may also happen if the target rejected all inputs we tried so far
#262144 pulse  corp: 1/1b lim: 2611 exec/s: 131072 rss: 80Mb
#524288 pulse  corp: 1/1b lim: 4096 exec/s: 104857 rss: 80Mb

after:

#51081  REDUCE cov: 136 ft: 184 corp: 13/2571b lim: 522 exec/s: 12770 rss: 107Mb L: 142/345 MS: 1 EraseBytes-
#52129  REDUCE cov: 136 ft: 184 corp: 13/2570b lim: 531 exec/s: 10425 rss: 107Mb L: 141/345 MS: 3 ShuffleBytes-PersAutoDict-EraseBytes- DE: "\377\377\377\377"-
#54805  REDUCE cov: 136 ft: 184 corp: 13/2553b lim: 549 exec/s: 10961 rss: 107Mb L: 328/328 MS: 1 EraseBytes-
#55451  REDUCE cov: 136 ft: 184 corp: 13/2552b lim: 549 exec/s: 11090 rss: 107Mb L: 196/328 MS: 1 EraseBytes-