Add casts to NULL, IS NOT NULL, IN and BETWEEN to MongooseRepository

[jlenon7]

Example:

Object.keys(where).forEach(key => {
    let value = where[key];

    if (value === 'null') value = null
    if (value === '!null') value = { $ne: null }

    if (Array.isArray(value)) {
        value = { $in: value }
    }

    if (value.includes('->')) {
        const firstValue = value.split('->')[0].replace(/\s/g, '')
        const secondValue = value.split('->')[1].replace(/\s/g, '')

        value = { $gte: firstValue, $lte: secondValue }
    }

    query.where(key, value);
});