getExerciseComment and getChildComments GraphQL queries

[HS-90]

Description: relates to #2400

This PR adds two GraphQL resolvers for getting exercise comments(filtered by exerciseId), and getting child comments(filtered by parentId). When implemented on the frontend, the getExerciseComment will get any main comments, and it's replies. Any nested replies beyond the first reply to main comments will be retrieved with getChildComments.

To test:
First we need to add comments

1. Go to 'api/graphql'
2. Write 3 mutations as follows:

mutation AddExerciseComment{ addExerciseComment(exerciseId:1, content:"Cool"){ id exerciseId content } }

mutation AddExerciseComment{ addExerciseComment(exerciseId:1, parentId: 1, content:" Really Really COOL!"){ id exerciseId parentId content } }

mutation AddExerciseComment{ addExerciseComment(exerciseId:1, parentId: 1, content:"Cool bro"){ id exerciseId parentId content } }

Getting Exercise Comments
3. Write a query to get all main comments with ExerciseId 1:
query GetExerciseComments{ getExerciseComments(exerciseId:1){ id createdAt exerciseId parentId content replies{ id createdAt content } } }

It should return something like this:

Getting Child Comments
4. Write a query to get all exerciseComment with parentId of 1:

query GetChildComments{ getChildComments(parentId:1){ id createdAt exerciseId parentId content } }

It should return something like this:

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[codecov]

Codecov Report

Merging #2480 (a96ed23) into master (55940b9) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #2480   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          186       186           
  Lines         3316      3324    +8     
  Branches       881       881           
=========================================
+ Hits          3316      3324    +8     

Impacted Files	Coverage Δ
graphql/resolvers/exerciseCommentCrud.ts	100.00% <100.00%> (ø)

[flacial]

This will only include the exercise comment replies and not the replies nested replies like

// Main exercise comment
{
  replies: [
    {
      // ...props -> It won't have this, right?
      replies: []
    }
    // reply2...etc
  ]
}

[flacial]

I think the answer is no

[HS-90]

Right it will retrieve all the 'main' comments and one nested layer of replies below that, then we use the getChildComments query to get the nested replies beyond that level.

[flacial]

Looks good! In a following PR, we can create their query files which will help in creating their hooks.

[HS-90]

Looks good! In a following PR, we can create their query files which will help in creating their hooks.

Thanks. Will do that in the next PR