* Removed managed-ledger-shaded artifact

* Fixed dep artifact renaming error

* Add support pulsar-kafka-adapter for kafka-0.8 api

clean up pulsar-kafka adapter

add tests

add low level consumer

add simple consumer

corrected pulsar-client-kafka_0_8

fix the module name

add batch and partitioned-topic support

fix headers

add getOffset api support

added pulsarOffset request/response

 clean up

* add pulsar-kafka integration test

* use earliestTime offset

* add default serializer/de

Fixes #3655

Master Issue: #3491

### Motivation
add support of Kerberos authentication for proxy

### Modifications
add support of Kerberos authentication for proxy ;
add unit test.

### Verifying this change
Ut passed

Fixes #3652

**Motivation**
Currently both Zookeeper and BookKeeper could be secured by using Kerberos, It would be good to support Kerberos in Pulsar Broker and Client.
This is the sub-task for issue in #3491 to support Kerberos in Pulsar Broker and Client.
Will add proxy and web resource support in following prs.
The Kerberos authentication is similar to that in Zookeeper and BookKeeper, which leverage SASL and GSSAPI, so reused some of the code there.
PR #3658 is the first version of PR before #3677 .

**Changes**
provide both client and broker side support for authentication api;
add unit test.

* adding a module that shades managed-ledger

* removing commented out lines

Signed-off-by: NSijie Guo <sijie@apache.org>

* Move pulsar functions dependency version to root pom and remove duplicated license headers

This addresses some comments in pulsar functions PR #1314

* shade worker

* Fix broken master

* Upgrade the bookkeeper storage client dependency to the official bookkeeper version

This removes the temp dependency in `pulsar-functions-instance`

* set `protobuf2.version` in pulsar-common

* provide a shaded worker

* include worker dependency at broker

* Embeded function worker at broker

* rename 'function worker' to 'functions worker'

* add "--no-functions-worker" for pulsar-client-cpp tests

* Updates headers with ASF source files header

* change license to additional files