[Feature Request] Enable special characters in the model name

[toni-moreno]

Related to this 2 issues:
vsergeyev/loudml-grafana-app#21
#62

In the context of automation/visualization would be great is we could parse certain parameters from model name. Right now as indicated here #62 , there is only one "not_commonly_used_character" in the valid character set ^[a-zA-Z0-9-_@]+$ this is the '@', underscore '_' and hyphen '-' are commonly used in measurement,tag,field names.

I suggest add these other characters. %- | - <espace> - : - ; - , - .

@regel What do you think about it?