extened search terms for man_made=monitoring_station

[mnalis]

"Monitoring station" is sometimes hard to find as people don't look for that name specifically, e.g. when one searches for "water level" or "bicycle_counter" (that one specifically has been requested elsewhere, e.g. Zverik/every_door#772)

Added search terms should help users found few extra uses of monitoring/measurement stations.

Description, Motivation & Context

Related issues

Closes #1331

Links and data

Relevant OSM Wiki links:

• https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dmonitoring_station

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- [ ] American English
- [ ] `name`, `aliases` (if present) use Title Case
- [ ] `terms` (if present) use lower case, sorted A-Z
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[tordans]

A nice follow up would be to add translated keys (title + description) to those values

[tordans]

This looks good to me, thanks.

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