move druid-ranger-security from core to contrib

[clintropolis]

Description

The druid-ranger-security extension doesn't seem to be actively maintained, and is very large, so this PR moves it from a 'core' extension to a 'contrib' extension.

This extension has quite a large size, so removing it also shrinks the binary distribution quite a bit.

before:

-rw-r--r--   1 clint  staff   652M Jan 14 12:21 apache-druid-32.0.0-SNAPSHOT-bin.tar.gz

after:

-rw-r--r--   1 clint  staff   571M Jan 14 12:07 apache-druid-32.0.0-SNAPSHOT-bin.tar.gz

If any committer wants to actively maintain this extension, I think it should be modified to use the ranger client https://github.com/apache/ranger/tree/master/intg/src/main/java instead of how it currently works, which I think would shrink the footprint in the binary distribution quite a lot.

Release note

druid-ranger-security has been moved from a 'core' extension to a 'contrib' extension to better reflect how actively it is maintained. This means it is no longer bundled with the binary distribution by default, but is still available to download the same as any other community extension.

[clintropolis]

i think we can ignore the coverage failures because it isn't new