RFR: 8280397: Factor out task queue statistics printing

[Thomas Schatzl]

On Mon, 24 Jan 2022 09:15:45 GMT, Per Liden <pliden at openjdk.org> wrote:

> [...] I'm thinking all collectors want to log in the same way [...]

That's why I initially put it in `CollectedHeap`, because the _collectors_ should determine where to log to, not necessarily the class. `CollectedHeap` already contains quite a few `print*` methods too.
There also were some experimental uses of `GenericTaskQueue` for other purposes than keeping oops I them recently (still in GC code).

Currently testing a change that simply moves the method as suggested. I do not have a very strong opinion about this.

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PR: https://git.openjdk.java.net/jdk/pull/7174