Warn about names which are numbers

[Klumbumbus]

Inspired by ​https://forum.openstreetmap.org/viewtopic.php?id=69711

for reference:
nodes and ways beginning with a number in saxony: ​https://overpass-turbo.eu/s/W5J

This produces nearly only false positives. The true positives are nearly all pure numbers. So here is pure numbers: ​https://overpass-turbo.eu/s/W5K

Most numerical names should be ref or addr:housenumber instead. There are still some false positives, so I guess it should still be better in severity 'other'.

[Klumbumbus]

In 16772/josm:

fix #19536 - Warn about numeric names (info level)

[GerdP]

I get warnings for
historic=milestone
milestone_type=kilometer_stone
name=19,9
Not sure if this is correct tagging? Wiki says that name should be used:
​https://wiki.openstreetmap.org/wiki/Tag%3Ahistoric%3Dmilestone

[skyper]

I think this is outdated tagging or tagging for the renderer. For numeric values use ref or *distance but not name.