add street name to metadata tiles

[kpwebb]

Proposed approach:

Add name field to OSMMetadata and WaySection elements. If only one version of the street name for all way sections the name goes in OSMMetadata otherwise we store each version in the WaySection and leave OSMMetadata blank. Open to suggestions on how to do this but goal is not to have tons of duplicate version of the street name for each reference.

[kpwebb]

added changes to builder in #11
Also updated proto buf spec to include names in sharedstreets/sharedstreets-ref-system/pull/18

[DenisCarriere]

👍 Names would be good, I doubt there will be a way to prevent duplicate names per each Reference. Including a name field seems very valuable.

[migurski]

This approach makes sense to me as well.