Update algorithms-related prototypes and schemas

beat/core/prototypes/algorithm.json

 {
   "language": "unknown",
+  "api_version": 2,
+  "type": "sequential",
   "splittable": false,
   "groups": [
     {

beat/core/prototypes/algorithm.py

 class Algorithm:
 
-    def process(self, inputs, outputs):
+    def process(self, inputs, data_loaders, outputs):
 
         # TODO: Implement this algorithm
 

beat/core/schema/algorithm/1.json

@@ -145,8 +145,9 @@
         "parameters": { "$ref": "#/definitions/parameters" },
         "splittable": { "type": "boolean" },
         "uses": { "$ref": "../common/1.json#/definitions/uses" },
-        "schema_version": { "$ref": "../common/1.json#/definitions/version" }
-
+        "schema_version": { "$ref": "../common/1.json#/definitions/version" },
+        "api_version": { "$ref": "../common/1.json#/definitions/version" },
+        "type": { "type": "string", "enum": [ "legacy", "sequential", "autonomous" ] }
       },
 
       "required": [