[Feat] Use standard Elixir logger

[sleipnir]

Still in line with my original intention of bringing Honey Potion closer to Elixir, this PR aims to introduce Logger functionality in the style of Elixir instead of having our users use the bpf_printk helper function directly.

So now we will do this to print:

require Logger 

def main() do
  pid = 1234
  user_id = 5678
  
  Logger.info("Process PID: #{pid}")
  # → bpf_printk("[INFO] Process PID: %d", pid);
  
  Logger.debug("User #{user_id} has PID #{pid}")
  # → bpf_printk("[DEBUG] User %d has PID %d", user_id, pid);
  
  Logger.error("Something went wrong")
  # → bpf_printk("[ERROR] Something went wrong");
  
  0
end

[Dwctor]

We have yet to merge this into main even once, so we can remove the deprecated versions before they even get to exist! (take this opportunity now or it might be a bother later)

I tend to run Honey Potion on Arch, and often I tend to see the deprecated failures and the random issues from using non-standard applications of Elixir's tools and it happens quite frequently (Elixir has quite fast development!)

[sleipnir]

This is done this way to comply with the Elixir API; otherwise, the behavior would be different from what is expected in the Elixir code. The goal of this PR is to be 100% compatible with the Elixir API, even for deprecated features. When it's removed from Elixir, we'll remove it here.

[Dwctor]

I really like the idea! As long as we don't deprecate/remove the bpf_printk for those that want/need it I find this to be a very welcome addition. I'll be checking if it runs fine and more when I get some more free time!

ps: One of the example files is in the wrong folder! (one is inside and the other outside lib, if you want to keep it out to show it's not supported make a new folder for future projects yet to be supported.)

[sleipnir]

I really like the idea! As long as we don't deprecate/remove the bpf_printk for those that want/need it I find this to be a very welcome addition. I'll be checking if it runs fine and more when I get some more free time!

Good.
In my opinion, the old scheme should be deprecated and eventually removed; with Logger, nobody would need to use the other one anymore. But for now, I won't do anything with the old module (not even deprecate it).

ps: One of the example files is in the wrong folder! (one is inside and the other outside lib, if you want to keep it out to show it's not supported make a new folder for future projects yet to be supported.)

Interpolation is supported; the file was accidentally in the wrong folder.

[sleipnir]

@Dwctor can we proceed with the merge? Have you finished the reviews?

[Dwctor]

Hi @sleipnir . I'm sorry, but I don't quite have the bandwidth to check Honey Potion in my day to day currently (just moved into a new place). From what I remember the branch had no issues and should be fine! Feel free to merge it.

[sleipnir]

No problem @Dwctor, I wish you well in your new place.