feat: hello_world plugin and example entrypoint

examples/hello-world.yaml

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+hello_step:
+  hello:
+    name: $name
+goodbye_step:
+  greet:
+    greeting: Goodbye
+    name: $name
+shout_step:
+  shout:
+    message: $goodbye_step.message

plugins/hello_world/__init__.py

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+# This Software (Dioptra) is being made available as a public service by the
+# National Institute of Standards and Technology (NIST), an Agency of the United
+# States Department of Commerce. This software was developed in part by employees of
+# NIST and in part by NIST contractors. Copyright in portions of this software that
+# were developed by NIST contractors has been licensed or assigned to NIST. Pursuant
+# to Title 17 United States Code Section 105, works of NIST employees are not
+# subject to copyright protection in the United States. However, NIST may hold
+# international copyright in software created by its employees and domestic
+# copyright (or licensing rights) in portions of software that were assigned or
+# licensed to NIST. To the extent that NIST holds copyright in this software, it is
+# being made available under the Creative Commons Attribution 4.0 International
+# license (CC BY 4.0). The disclaimers of the CC BY 4.0 license apply to all parts
+# of the software developed or licensed by NIST.
+#
+# ACCESS THE FULL CC BY 4.0 LICENSE HERE:
+# https://creativecommons.org/licenses/by/4.0/legalcode

plugins/hello_world/tasks.py

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+# This Software (Dioptra) is being made available as a public service by the
+# National Institute of Standards and Technology (NIST), an Agency of the United
+# States Department of Commerce. This software was developed in part by employees of
+# NIST and in part by NIST contractors. Copyright in portions of this software that
+# were developed by NIST contractors has been licensed or assigned to NIST. Pursuant
+# to Title 17 United States Code Section 105, works of NIST employees are not
+# subject to copyright protection in the United States. However, NIST may hold
+# international copyright in software created by its employees and domestic
+# copyright (or licensing rights) in portions of software that were assigned or
+# licensed to NIST. To the extent that NIST holds copyright in this software, it is
+# being made available under the Creative Commons Attribution 4.0 International
+# license (CC BY 4.0). The disclaimers of the CC BY 4.0 license apply to all parts
+# of the software developed or licensed by NIST.
+#
+# ACCESS THE FULL CC BY 4.0 LICENSE HERE:
+# https://creativecommons.org/licenses/by/4.0/legalcode
+import structlog
+from dioptra import pyplugs
+
+LOGGER = structlog.get_logger()
+
+
+@pyplugs.register()
+def hello(name: str) -> str:
+    message = f"Hello, {name}"
+    LOGGER.info(message)
+    return message
+
+
+@pyplugs.register()
+def greet(greeting: str, name: str) -> str:
+    message = f"{greeting}, {name}"
+    LOGGER.info(message)
+    return message
+
+
+@pyplugs.register()
+def shout(message: str) -> str:
+    message = message.upper()
+    LOGGER.info(message)
+    return message