NIFI-6703: Fixed extracted nar directory and marked api as experimental
NIFI-6703: Moving nifi-stateless into nifi-framework
NIFI-6703: Refactored to fix jetty/spring issues
NIFI-6703: checkstyle fix
NIFI-6703: updated to mirror traditional NiFi's bootstrap process and java11 dependency management
NIFI-6703: minor changes
NIFI-6703: Documentation fixes
This closes#3795.
Signed-off-by: Bryan Bende <bbende@apache.org>