Enum name attribute too restrictive

[peterdsdoyle]

Currently an Enum name is restricted to 'symbolicName'. This can be restrictive for a system that requires encoding of known names Eg. ApplicationId->RET-AD
RET-AD could not be encoded as an Enum name and would therefore need to be altered to some other form such as RET_AD, this imposes complexity for upstream and downstream systems to map from/to the 'known' value.
[aeron-io/simple-binary-encoding/issues/760]

[donmendelson]

The current rule for SBE names is similar to identifier rules in C++:

• Allows alpha, digit, underscore
• Cannot begin with a digit

Other programming languages are similar.

How would it work if SBE allowed hyphen?

A specific proposal would be helpful for discussion.