Feature: Add ability to assign different exercises to each student automatically

[Rui00Barata]

Related user(s):

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Related issue(s) or PR(s):

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Related project scope(s):

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The problem:

Currently, the Learn-OCaml platform allows teachers to assign the same exercises to all students or to assign individual exercises to each student separately. However, some teachers may want to assign different sets of exercises to different students based on their learning needs or abilities.

Wanted solution:

Our current solution is based on this approach:

1. The teacher has to chose which exercises and students he wants to assign
2. A set of exercises is attributed to each selected student based on the settings provided by teacher that says how many exercises of each difficulty should be assigned to each student level.

Considered alternatives:

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Additional context:

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