Motorway service filter option

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/motorway-service-filter-option/
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I prefer staying on the highway and just charging at the nearest Serway etc bc there I know for sure they'll have bathrooms + coffee to go. It would be nice if I could filter for that in the route planning.