Add average rank computation column

[Didayolo]

Description

Add a computation column "average rank". It computes the fractional ranking of each sub-column, then the average. It needed to be injected because it involves comparison with other submissions. The score get updated everytime a submission is added or removed from the leaderboard.

Issues this PR resolves

• Closes [Feature] Ranking program: organizer provides the code for computation between leaderboard columns #406

A checklist for hand testing

• From competition.yaml
• From the editor
• Add and remove submissions from the leaderboard and check that the average rank is right

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge

[ihsaan-ullah]

Test 1:

3 submissions with the following scores and rank

Submission	Accuracy	F1 Score	Average Rank
Sub 1	0.90	0.80	1.5
Sub 2	0.70	0.95	2.0
Sub 3	0.80	0.70	2.5

When submission 2 removed, the rank changes to 1 and 2

Submission	Accuracy	F1 Score	Average Rank
Sub 1	0.90	0.80	1
Sub 3	0.80	0.70	2

[ihsaan-ullah]

Test 2:

3 submissions with the following scores and rank

Submission	Accuracy	F1 Score	Average Rank
Sub 1	0.90	0.85	1.75
Sub 2	0.75	0.90	2.0
Sub 3	0.90	0.70	2.25

When submission 1 removed, the rank changes to 1.5 and 1.5

Submission	Accuracy	F1 Score	Average Rank
Sub 2	0.75	0.90	1.5
Sub 3	0.90	0.70	1.5

[ihsaan-ullah]

Test 3:

• Works from the editor
• Works from competition yaml
• Adding, removing submissions updates the rank

[ihsaan-ullah]

Test Resources

I have used this competiiton bundle for testing: Avg_Rank_Bundle.zip

The submission for this bundle has the scores which are copied to the leaderboard. Here is a sample submission: Sample_Submissino.zip

[Didayolo]

@ihsaan-ullah Thank you for the review!