Warn about conflicting or unneeded values in access tags

[skyper]

As #19419 and #21192 were short handed and reverted, a warning about conflicting or unneeded values in access tags with multiple values is still useful.

Examples

access=permit;yes
vehicle=private;designated
motor_vehicle=forestry;agricultural;no
hgv=yes;no
bus:forward=private;designated
bus:both_ways:backward=no;designated
access:lanes=no|yes;no|yes
access:lanes:both_ways:forward=agricultural;forestry;no|yes

I am not smart enough or there might be no easy solution to solve this in mapcss. Probably this needs to be written in own java code.

[taylor.smock]

Possibly related: #18383 (this added a class specifically to figure out what access tags overrode other access tags).

[skyper]

Maybe, we can sort the values in two groups. One with values which should be solo and one with values which are possible as multi and only warn about the first group.
no, yes, designated, permissive and probably private do not work with additional values.

[aceman]

'private' could go with other values like 'delivery' or 'agricultural'.