Make CORS option configurable

[nicolargo]

Related to #2802

Make the CORS section of the API configurable:

        # FastAPI Enable CORS
        # https://fastapi.tiangolo.com/tutorial/cors/
        self._app.add_middleware(
            CORSMiddleware,
            # Related to https://github.com/nicolargo/glances/discussions/2802
            # allow_origins=[self.bind_url],
            allow_origins=["*"],
            allow_credentials=True,
            allow_methods=["*"],
            allow_headers=["*"],
        )

the origins, credentials , methods and headers should be configurable from the Glances configuration file:

[outputs]
cors_origins=*
cors_credentials=True
cors_methods=*
cors_headers=*

Default values should be the ones in th previous example.

[nicolargo]

Merged into develop.

[LeeThompson]

Working great! Thank you so much!