feature/Create available spaces service

[jsurrea]

This PR implements the basic functionalities for the "Available Spaces" Service. Solves #1

Expected Request (API REST): GET http://34.133.121.100:3000/ With Body (JSON):

{
  "dayOfWeek": 1 letter string either 'l' | 'm' | 'i' | 'j' | 'v' | 's' | 'd',
  "startTime": 4 digit string (hhmm),
  "endTime": 4 digit string (hhmm)
}

Expected Response (JSON):

[
  {
    building: string (example "W"),
    room: string (example "101"),
    availableFrom: 4 digit string (hhmm),
    availableUntil: 4 digit string (hhmm),
    minutesAvailable: integer number between 0 and 1440
  }, ... (0 or more of these)
]

DEMO:

https://github.com/ISIS3510-202410-Team-13/Backend/assets/68788933/dcf7259e-4168-42d5-82c2-924b848f80e9

Troubleshooting: Here are some 4xx errors you might get while fetching this API and their causes (validations)

  if (!req.body) {
    res.status(400).send({ message: 'Request body is missing' });
    return;
  }

  const { dayOfWeek, startTime, endTime } = req.body;

  if (dayOfWeek === undefined || startTime === undefined || endTime === undefined) {
    res.status(400).send({ message: 'Missing required fields in request body' });
    return;
  }

  if (typeof dayOfWeek !== "string" || typeof startTime !== "string" || typeof endTime !== "string") {
    res.status(400).send({ message: 'Invalid data types in request body' });
    return;
  }

  if (dayOfWeek.length !== 1 || !["l", "m", "i", "j", "v", "s", "d"].includes(dayOfWeek)) {
    res.status(400).send({ message: 'Invalid day of week' });
    return;
  }

  if (!/^\d{4}$/.test(startTime) || !/^\d{4}$/.test(endTime)) {
    res.status(400).send({ message: 'Invalid time format' });
    return;
  }

  if (startTime >= endTime) {
    res.status(400).send({ message: 'Start time must be before end time' });
    return;
  }

  if (startTime < "0000" || startTime >= "2400" || endTime < "0000" || endTime >= "2400") {
    res.status(400).send({ message: 'Invalid time range' });
    return;
  }

  if (startTime.slice(-2) > "59" || endTime.slice(-2) > "59") {
    res.status(400).send({ message: 'Invalid minutes' });
    return;
  }

Note: Currently filters available spaces only for these buildings: ["ML", "SD", "W", "R", "O", "C", "LL", "B", "RGD", "AU"];