[maven-plugin] Prefix to use number based columns as enum constants

[tcmj]

description

a enum value has to begin with a alphanumeric value and not a number
we need a prefix option

example

|0100|foo|
|0200|bar|

what we need

• we could simply use a naming strategy with a fixed prefix like NO_
• we could add a new config property to prefix the constants
• ...

usecases

• overcome the restriction of: numbers are not allowed as java enum constants
• use numerics as constants like country code, field numbers, and so on