Add [gke] and [test] optional dependencies with kubernetes

Why:
Pathways on Cloud GKE utilities and unit tests require kubernetes and pyyaml. Declaring optional dependency extras [gke] and [test] in pyproject.toml and updating requirements.txt enables installation of GKE and test dependencies.

How:
- Add gke and test extras to pyproject.toml under [project.optional-dependencies].
- Add kubernetes and pyyaml to requirements.txt.

What:
- Enables pip install 'pathwaysutils[gke]' and pip install 'pathwaysutils[test]'.

Author: lukebaumann

pyproject.toml

@@ -38,6 +38,15 @@ dev = [
     "pylint>=2.6.0",
     "pyink",
 ]
+gke = [
+    "kubernetes",
+    "pyyaml",
+]
+test = [
+    "kubernetes",
+    "pyyaml",
+    "pytest",
+]
 
 [tool.pyink]
 # Formatting configuration to follow Google style-guide

requirements.txt

@@ -5,3 +5,5 @@ orbax-checkpoint
 uvicorn
 requests
 packaging
+kubernetes
+pyyaml