Proxito: use cacheops for 2 more models (#10106)

`Organization` and `PlanFeature` weren't being cached by `cacheops` and they are
used when serving documentation.

By caching these, we will be caching all the models used when serving
documentation, reducing the db hits and a also a litte the response time.

readthedocs/settings/base.py

@@ -1055,4 +1055,14 @@ def DOCKER_LIMITS(self):
             'ops': CACHEOPS_OPS,
             'timeout': CACHEOPS_TIMEOUT,
         },
+
+        # readthedocs.organizations.*
+        'organizations.organization': {
+            'ops': CACHEOPS_OPS,
+            'timeout': CACHEOPS_TIMEOUT,
+        },
+        'organizations.planfeature': {
+            'ops': CACHEOPS_OPS,
+            'timeout': CACHEOPS_TIMEOUT,
+        },
     }