Remove the deprecated StringArray and DataArray, which have been
replaced by the dynamic buffer.

See:
- bpf-common/include/buffer.bpf.h
- bpf-common/src/parsing/buffer_index.rs

A warning was making all CI builds but x86_64 fail (I guess `-Werror`
got somehow enabled)

Also, since warnings are generally trivial to solve, but make the actual
compiler output hard to decipher, I think it's better to force to
address them.

Old code didn't take advantage of dynamic buffer and always wrote
the whole event, even if most if it was unused.

Create an output.bpf.h with macros and utility functions for emitting
perf events.

Improve get_path_str and make it compatible again with 20 components, as
before the dynamic buffer refactor.

…-ebpf-events-more-memory-efficient