Add beacon state unmarshal fuzzer, afl support (#6625)

* Add AFL third_party libraries

* add beacon state fuzzing, add afl fuzz bundle

* rm fuzzing engine

* fix and lint

* Check for array out of bounds when calculating proposer delta

* failing test

* fix

* Checkpoint progress

* Add requirement that inclusion distance is not zero, add regression test

* No need for HTR since that is covered in process slots

* Removing some fuzzit logic, old fuzz tests

* Add ssz encoder test and fix

* Fuzzing checkpoint, adding fuzzing to the p2p layer

* ignore some libfuzzer files

* Full testing of p2p processing of blocks, with some mocked stuff

* use tmpdir and always process blocks

* use checkptr

* Update ethereumapis

* go mod tidy

* benchmarks for ferran's fast ssz hash tree root

* Update fastssz

* fmt

* gaz

* goimports

* Fix

* fix ethereumapis

* fix again

* kafka

* fix gen file

* fix compute signing root

* gofmt

* checkpoint progress

* progress

* checkpoint

* updates

* updates

* merge fix

* WIP

* merge

* fix build

* fix merge related issues

* cleanup

* revert unrelated

* lint

* lint

* lint

* manual tags for fuzz

* Commentary on upload script

* some import fixes, but not all

* fix //fuzz:fuzz_tests

* rm unused test

* update generated ssz

* Set // +build libfuzzer

* remove debug code

* A bit of refactoring ot explain why there is a committee_disabled file

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

.gitignore

@@ -29,3 +29,7 @@ password.txt
 
 # Dist files
 dist
+
+# libfuzzer
+oom-*
+crash-*