* 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

- Remove function-composition

- the package will be generated under `dist/target/`

Refactored instance related stuff into instance as well as rejiggered utils into its own module (#248)

* Refactored instance related stuff into instance as well as rejiggered utils into its own module

* Discard empty files

because pulsar-client is using patched protobuf, while dlog/bookkeeper/functions uses same proto3.

- move cli related classes to a CLI module
- use pulsar-client (shaded jar) for runtime
- use dlog (unshaded jar) in worker

* Move worker module out of runtime module

* Fix license header issues

* Provide a jmh benchmark to benchmark thread container

* Rebased to latest master

* revert the scripts

* Create pulsar-functions module (#1)

* Create pulsar-functions module

* rename `sdk` package to `api`

* Added the first cut of the Java interface for Pulsar functions (#2)

* Refactored serialization/deserialization into an interface

* Split functions module into api/runtime/api-examples

* Move `org.apache.pulsar.functions.api` package from runtime to api package

- introduce a `fs` package for function state related classes
- add `FunctionConfig` for user defined function configurations
- add `CmdFunctions`: it takes a yaml file and also command parameters

* Create pulsar-functions module

* rename `sdk` package to `api`

* Updates headers with ASF source files header

* change license to additional files