fix: delay initialization to the first query

[supercaracal]

• Redis::Cluster attempting Redis connection during asset precompilation redis/redis-rb#1276

[supercaracal]

https://stackoverflow.com/questions/9853086/is-in-ruby-thread-safe

[corrupt952]

Hi! 👋

I'm investigating the behavior of the redis-clustering gem and came across this PR.
I have a question about this specific method:

Why does this method directly access the @router variable instead of using the router method like other methods?
It seems that calling the router method would initialize @router.

Is there a specific reason for this approach? Any insights would be greatly appreciated!

Thanks in advance for your help!

[supercaracal]

Since the inspect method doesn't call a command, I thought it shouldn't be done the initialization.