Refactoring - docs, tests and examples (#143)

1. Restructure project directories. 
  -- Moved `internal/testdata` to `test/testdata`. 
  -- Moved `test/common/common.go` to `testdata/util.go` (to avoid exposing that `common` package)
2. Added executable **hello world!** example under `examples` module.
3. Api Docs - added a `\n` between License and package declaration to prevent License from being parsed as part of the package documentation.
4. Removed outdated API reference under `docs`. https://pkg.go.dev/github.com/conductor-sdk/conductor-go will be the source of truth.
5. Changes in `README.md` 
 -- Removed running conductor section. 
 -- Use updated hello world example (More to come).
6. Fix License.

Dockerfile

@@ -1,6 +1,5 @@
 FROM golang:1.17 as build
 RUN mkdir /package
-COPY /internal /package/internal
 COPY /sdk /package/sdk
 COPY /go.mod /package/go.mod
 COPY /go.sum /package/go.sum

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright [yyyy] [name of copyright owner]
+   Copyright 2024 Orkes, Inc.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.