feat: Added array support

[Jamess-Lucass]

Adds support for schema.Array()
Comes with functions:

• Min
• Max

takes an argument of any type that implements the ISchema interface.

examples:

schema.Array(schema.String())

schema.Array(schema.String()).Min(1)
// Requires at least 1 element in the array

schema.Array(schema.String().Max(10)).Min(1)
// Requires at least 1 element in the array where the item has a max length of 10

schema.Array(schema.Object(map[string]schema.ISchema{
    "Firstname": schema.String().Min(4),
}))

// An array of objects where the property `Firstname` must be a string of minimum 4 characters

// [{Firstname: "john"}, {Firstname: "Doe"}] // 1st is valid, 2nd is invalid