nixos.mautrix-facebook: init module

This is the first version of the mautrix-facebook module. Due to lack of secret support on NixOS as well as the requirement of a homeserver domain it requires some setup. For completeness here is my working config using NixOps secrets:

```nix
deployment.keys."mautrix-facebook-config.env" = {
	text = ''
		MAUTRIX_FACEBOOK_APPSERVICE_AS_TOKEN=${secrets.as_token}
		MAUTRIX_FACEBOOK_APPSERVICE_HS_TOKEN=${secrets.hs_token}
	'';
	destDir = "/var/keys";
};

deployment.keys."mautrix-facebook-registration.yaml" = {
	text = builtins.toJSON config.services.mautrix-facebook.registrationData;
	destDir = "/var/keys";
	user = "matrix-synapse";
};

users.users.matrix-synapse.extraGroups = ["keys"];

systemd.services.matrix-synapse.after = ["keys.service"];
systemd.services.matrix-synapse.wants = ["keys.service"];

services.mautrix-facebook = {
	enable = true;
	settings = {
		homeserver.domain = "bots.kevincox.ca";

		bridge = {
			displayname_template = "{displayname}";

			permissions = {
				"@kevincox:matrix.org" = "admin";
			};
		};
	};

	environmentFile = "/var/keys/mautrix-facebook-config.env";

	registrationData = {
		as_token = secrets.as_token;
		hs_token = secrets.hs_token;
	};
};

systemd.services.mautrix-facebook = rec {
	wants = ["keys.target"];
	after = wants;
};

services.matrix-synapse.app_service_config_files = [
	"/var/keys/mautrix-facebook-registration.yaml"
];
```

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