Prepare for classification of `comments`

[John Pangas]

There are some tasks that need to be done to prepare for comment models:

Tasks

Beta Give feedback

1. Create a function to get_comment from Bugzilla using comment_id
2. Create a comment_classifier script that classifies using comment_id
3. Create a function in http_service to classify comments using a list of comment_ids
4. Create a comment classification job.
5. Create a function to classify a single or batch comments. (in http_service/bugbug_http/app.py)

This issue would also be a good place to discuss on the best way to run models on comments:
With the proposed task list above, it was considering to classify comments independently of bugs by using comment_ids.

I thought it would be wise to separate this work from #3994 to minimise the amount of reviews needed to land the model.

[John Pangas]

WDYT @suhaibmujahid and @marco-c ?

[Marco Castelluccio]

Sounds like a good plan to me. In the future, we might consider adding the bug ID too in case of a model which would classify a given comment based on the previous context.