Update readme for this branch

add bpf benchmark application

tests/bpf: Call bpf_setup before execution

gcoap_bpf: Extend example

bpf: Extend with gcoap and fmt functions

fuzzing: Add some documentation on writing fuzzing applications

bpf: Update with pre-flight checks

bpf: optimize jumptable condition instructions

bpf: add gnu jumptable implementation

update VM

bpf: Add memory protection features

tests/bpf: Extend test files

bpf: Extend with gcoap

fixup! bpf: update VM

fixup! add gcoap bpf example