Any plan to support Unicode in metric name?

[jiacai2050]

Original promql only support limited ascii characters, it would be helpful to support other UTF-8 characters for non-English users

This is my fork to support Chinese chars, It requires small changes to the lexer.

• jiacai2050@5cb9cb9

[hzwwww]

@jiacai2050 Is it possible to query the Unicode metric without escaping char, because some promQL builder like grafana will not add the escaping char also.