Feat/normalizing state

[Guilherme-NL]

Normalized state

In this PR, we normalized the stories and pastIteration in the Redux state.

Stories

The data was in the format below:

    {
        "id": 4,
        "title": "A user should be able to estimate features",
        "description": null,
        "estimate": 3,
        "storyType": "feature",
        "state": "started",
        "acceptedAt": null,
        "requestedById": 1,
        "ownedById": 1,
        "projectId": 1,
        "createdAt": "2023/10/02 16:54:44 -0300",
        "updatedAt": "2023/10/11 10:32:07 -0300",
        "position": "5.5",
        "labels": [
            {
                "id": 0,
                "name": "estimates"
            },
            {
                "id": 1,
                "name": "features"
            }
        ],
        "requestedByName": "Foo Bar",
        "ownedByName": "Foo Bar",
        "ownedByInitials": "FB",
        "releaseDate": null,
        "deliveredAt": "2023/10/04 16:49:42 -0300",
        "newPosition": null,
        "errors": {},
        "notes": [],
        "tasks": [],
        "collapsed": true
    }

Considering this, for now, we implemented a simpler normalization:

{
    stories: {
    byId: {
      1: {id: 1, ...},
      2: {id: 2, ...}
      },
    allIds: [1, 2]
    }
}

PastIterations

The data was in the format below:

    {
      startDate: '2023/08/02',
      endDate: '2023/08/06',
      iterationNumber: 1,
      stories: [],
      points: 0,
      hasStories: false
    }

Normalized data example:

{
    pastIterations: {
        byId: {
        1: {iterationNumber: 1, ...},
        2: {iterationNumber: 2, ...}
        },
        allIds: [1, 2]
    }
}

normalize and denormalize

I created functions to handle normalization and denormalization. I believe this was the biggest challenge of this task. After calling normalization and denormalization in the correct places, it is easy to make changes to the structure of the normalized object, since the function is isolated and no longer interferes with the functioning of the application

To ensure that everything was working as before, I applied normalization only in the reducer. And I denormalized for functions that used the state as input.

Addition multiple new stories:

We changed the default id of new stories to a Symbol (new-${Date.now()}, this way we can uniquely identify each new story, and add multiple new stories at the same time.

[talyssonoc]

I added some comments about using selectors