Adapt metrics endpoint to accept filtering parameters

[marcospri]

• Adapt students metrics endpoint to allow filtering by student

• Allow filtering on the students metrics endpoint #6419

The endpoint should accept a list of student IDs, returning only those students in the list.

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• Adapt assignments metrics endpoint to allow filtering by student and/or assignments

• Filter assignment metrics by users #6429

• Filter assignment metrics by assignment IDs and user h_userid #6430

The endpoint should accept a list of student IDs and/or assignment IDs.

The assignment IDs will be used to return only those assignments in the list.
The student IDs will be used to only count those students annotations/replies.

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• Adapt courses metrics endpoint to allow filtering by courses, student and/or assignments

• Filter course metrics by users #6434

• Filter courses by assignment IDs #6435

The endpoint should accept a list of course IDs, student IDs and/or assignment IDs.

• The course IDs will be used to return only those courses in the list.
• The assignment IDs will affect the assignment counts for every course, and the last launch date.
• The student IDs will affect the last launch date, as only these students will be taken into consideration.