config: extract config structs to its own pkg

[geyslan]

1. Explain what the PR does

Fix: #3031

1f91b80 config: move pcaps Config struct to pkg/config _{(2023/jun/13) Geyslan Gregório <geyslan@gmail.com>}

It names the struct `PcapsConfig` and moves it to pkg/config.

ec36fe9 flags: rename OutputConfig to PrepareOutputResult _{(2023/jun/13) Geyslan Gregório <geyslan@gmail.com>}

0cb1395 config: extract config structs to its own pkg _{(2023/jun/13) Geyslan Gregório <geyslan@gmail.com>}

This extracts the config file from the ebpf package to its own.
It also moves into the config package PrinterConfig and
flags/OutputConfig renaming the latter to PrinterOutputConfig.

2. Explain how to test it

3. Other comments

[josedonizetti]

@geyslan why didn't we also bring the engine.Config, since all configs will be under pkg/config why not the engine as well?

[geyslan]

@geyslan why didn't we also bring the engine.Config, since all configs will be under pkg/config why not the engine as well?

I think it makes sense. Besides engine we have also pcaps.

[geyslan]

Bringing the engine configuration into pkg/config made the tracee-rules now dependent on pkg/config. So this build change is required:

https://github.com/aquasecurity/tracee/pull/3228/files#diff-76ed074a9305c04054cdebb9e9aad2d818052b07091de1f20cad0bbac34ffb52R498-R503

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For signatures as well. So, @rafaeldtinoco and @NDStrahilevitz, is there some impact of depending (in the build process) on the libbpf in signatures and tracee-rules - due to that type relocation (Config).

[geyslan]

Bringing the engine configuration into pkg/config made the tracee-rules now dependent on pkg/config. So this build change is required:

https://github.com/aquasecurity/tracee/pull/3228/files#diff-76ed074a9305c04054cdebb9e9aad2d818052b07091de1f20cad0bbac34ffb52R498-R503

For signatures as well. So, @rafaeldtinoco and @NDStrahilevitz, is there some impact of depending (in the build process) on the libbpf in signatures and tracee-rules - due to that type relocation (Config).

@josedonizetti I'm going to drop that engine config relocation commit. Currently, it would create dependencies not really needed. We'll come back to that when we get rid of the rules bin.

[rafaeldtinoco]

I agree on not making tracee-rules depending on libbpf just now (add a TODO for when we have the single binary if some other change is needed). LGTM