Names.parseName slow due to regex pattern compilation about frigga

[DanielThomas]

@brharrington I've worked around this for our use case by holding onto the parsed names, but seems like a nice improvement.

[brharrington]

FWIW with the common IPC project we needed to parse ASG names and ended up just using different logic without regex, summary of JMH benchmarks:

https://github.com/Netflix/spectator/blob/master/spectator-ext-ipc/src/jmh/java/com/netflix/spectator/ipc/ServerGroupParsing.java#L26

Alternative parser:

https://github.com/Netflix/spectator/blob/master/spectator-ext-ipc/src/main/java/com/netflix/spectator/ipc/ServerGroup.java

That said if there are some simple improvements to frigga, it seems like that could benefit many teams.

[DanielThomas]

Ah, that alternative will work better for us - we're only ever doing this for server groups.

Nope - that doesn't have the push (i.e. v000) and we need that. I'll stick with parsing them once for now.