Disallow the `readonly_write_lock` clippy check

[MichaelScofield]

This should be a todo that we later revisit if locks can improved. And we should suppress the warning in place where it's not the case.

We can create an issue for it.

Originally posted by @tisonkun in https://github.com/GreptimeTeam/greptimedb/pull/3740#discussion_r1571692609