Extract Tracee package out of ebpf package

tracee.go is currently placed under the ebpf package although it includes stuff not related to ebpf (e.g. Tracee "state").
It will be better to extract all the stuff not directly related to ebpf into a new "Tracee" package

Start by reading tracee.go and mapping which declarations are unrelated to eBPF, then inspect how the ebpf package references them. Define the boundary of the new Tracee package before moving code, and verify that package references and tests still work after the extraction.

Written by the indexing model from the issue text.