Add search terms for monitoring_station (#1347)

Generally, but also specifically for bicycle counters and water levels

data/presets/man_made/monitoring_station.json

@@ -18,7 +18,12 @@
         "earthquake",
         "seismology",
         "air",
-        "gps"
+        "gps",
+        "traffic counter",
+        "bicycle counter",
+        "bike counter",
+        "water level",
+        "measurement station"
     ],
     "tags": {
         "man_made": "monitoring_station"