Allow CORS with Middleware

[rfschubert]

PR this Middleware to core of Masonite

""" CORS Middleware """

from masonite.request import Request


class CORSMiddleware:
    """CORS Middleware
    """

    CORS = {
            "Access-Control-Allow-Origin": "*"
        }

    def __init__(self, request: Request):
        """Inject Any Dependencies From The Service Container

        Arguments:
            Request {masonite.request.Request} -- The Masonite request object
        """

        self.request = request

    def after(self):
        """Run This Middleware After The Route Executes
        """
        '''"
                |--------------------------------------------------------------------------
                | Create Dictionary of CORS headers
                |--------------------------------------------------------------------------
                |
                | Appends CORS headers to HTTP response
                |
                | Ex. cors = {"Access-Control-Allow-Origin": "*",
                |             "Access-Control-Allow-Headers": "Content-Type",
                |             "Access-Control-Allow-Methods": "DELETE, GET, HEAD, OPTIONS, PATCH, POST, PUT"}
                |
                ''""
        for key, value in self.CORS.items():
            self.request.header(key, value, http_prefix=None)

Also create some tests

[vaibhavmule]

Note: Referencing #320 to check conversation around adding CORS middleware in past.

[rfschubert]

Note: Referencing #547 a PR with the conclusion