Handle new guava version (vendor class)

[timja]

related to jenkinsci/bom#423

cc @basil @dwnusbaum @car-roll @jglick @bitwiseman

[jglick]

Do not put this in the API package.

[timja]

moved

[jglick]

merge with master

[car-roll]

@bitwiseman do you have merge permissions?

[timja]

@car-roll I fixed your permissions,

I've moved away from vendoring in here and used reflection, there was a lot of classes.
We could shade it if required: https://github.com/google/guava/wiki/UseGuavaInYourBuild#what-if-i-want-to-use-beta-apis-from-a-library-that-people-use-as-a-dependency

FTR it's still not out of beta in latest master: google/guava#3423

[timja]

@dwnusbaum

[timja]

could someone merge and release?

[basil]

FYI this still needs a release I think.