feat: Implement 'groupbyattrs' processor

[lopes-felipe]

Description

Include the groupbyattrs as another processor option.

[cla-checker-service]

💚 CLA has been signed

[lopes-felipe]

Hey @edmocosta! Would you mind taking a look at this whenever you can? Thanks! :)

[edmocosta]

Hi @lopes-felipe, thank you for your PR, I have a limited bandwidth at the moment, but I will take a look at this as soon as possible :)

[lopes-felipe]

Hi @lopes-felipe, thank you for your PR, I have a limited bandwidth at the moment, but I will take a look at this as soon as possible :)

No worries @edmocosta, I just wanted you to be aware of this. Take the time you need :) (and great work, btw)

[lopes-felipe]

@edmocosta did you have a chance to take a look at this?

[edmocosta]

Hi @lopes-felipe, I'm so sorry for the delay.
The PR looks good to me and it seems to be working fine, but there's still some internal discussions going on regarding supporting Collector components that are not OTTL-based, and what that would mean for the future of this project.
Please allow me a few more days, and I'll be back to you with a better answer. Thank you!