Refine annotation recipe & added custom routing

[laurejt]

Associated Issue(s): N/A

Changes in this PR

• Added a global variable setting the number of annotations needed for a task by language
• Added custom task routing logic
• Added custom logic for calculating the expected number of annotations for a more accurate "source progress"

Notes

• Custom logic assumes that the session name has a starting prefix indicating the language e.g., "pt_". The session id adds a prefix before the session name, so we determine the viable sessions (i.e, annotators) for a task by checking if the session_id contains "-[src_lang]_".

Reviewer Checklist

[rlskoeser]

Looks reasonable to me, just might be worth a comment clarifying how the minimums were determined (I assume this is based on annotator availability)

[rlskoeser]

Maybe add a comment on how they numbers were determined? (Is this based on availability of annotators for languages?)

[laurejt]

Yes, based on availability of annotators. Mostly just special-casing the languages that are only expected to have a single annotator.