ARI: Add the ability to download the media associated with a stored recording

This patch adds a new feature to ARI that allows a client to download
the media associated with a stored recording. The new route is
/recordings/stored/{name}/file, and transmits the underlying binary file
using Asterisk's HTTP server's underlying file transfer facilities.

Because this REST route returns non-JSON, a few small enhancements had
to be made to the Python Swagger generation code, as well as the
mustache templates that generate the ARI bindings.

ASTERISK-26042 #close

Change-Id: I49ec5c4afdec30bb665d9c977ab423b5387e0181

rest-api/api-docs/recordings.json

@@ -69,6 +69,38 @@
 				}
 			]
 		},
+		{
+			"path": "/recordings/stored/{recordingName}/file",
+			"description": "The actual file associated with the stored recording",
+			"operations": [
+				{
+					"httpMethod": "GET",
+					"summary": "Get the file associated with the stored recording.",
+					"nickname": "getStoredFile",
+					"responseClass": "binary",
+					"parameters": [
+						{
+							"name": "recordingName",
+							"description": "The name of the recording",
+							"paramType": "path",
+							"required": true,
+							"allowMultiple": false,
+							"dataType": "string"
+						}
+					],
+					"errorResponses": [
+						{
+							"code": 403,
+							"reason": "The recording file could not be opened"
+						},
+						{
+							"code": 404,
+							"reason": "Recording not found"
+						}
+					]
+				}
+			]
+		},
 		{
 			"path": "/recordings/stored/{recordingName}/copy",
 			"description": "Copy an individual recording",