[autoscaler] Replace cluster yaml validation with json schema v… (#7261)

* replace manual cluster yaml validation with json schema
- improved error message
- support for intellisense in VSCode (or other IDEs)
- run linting
- moved schema to ray/autoscaler
- fixed typo
- remove importlib dependency

* Update python/ray/autoscaler/autoscaler.py

* read

* restrict allowed properties

* added unit test for invalid yaml
added ray[test] package (remove pytest from default dependencies)

* updated autoscaler test to use ValidationError exception

* add missing dependency

* added pytest

* replace manual cluster yaml validation with json schema
- improved error message
- support for intellisense in VSCode (or other IDEs)
- run linting
- moved schema to ray/autoscaler
- fixed typo
- remove importlib dependency

* Update python/ray/autoscaler/autoscaler.py

* read

* restrict allowed properties

* added unit test for invalid yaml
added ray[test] package (remove pytest from default dependencies)

* updated autoscaler test to use ValidationError exception

* add missing dependency

* added pytest

* removed parameterized dependency
reverted ray[test] intro

* removed parameterized

* fix_tests

* format

Co-authored-by: Ubuntu <marcozo@mc-ray-jumpbox.chcbtljllnieveqhw3e4c1ducc.xx.internal.cloudapp.net>
Co-authored-by: Richard Liaw <rliaw@berkeley.edu>

python/setup.py

@@ -75,7 +75,7 @@ extras = {
     "debug": [],
     "dashboard": [],
     "serve": ["uvicorn", "pygments", "werkzeug", "flask", "pandas", "blist"],
-    "tune": ["tabulate", "tensorboardX"],
+    "tune": ["tabulate", "tensorboardX"]
 }
 
 extras["rllib"] = extras["tune"] + [
@@ -178,6 +178,7 @@ requires = [
     "packaging",
     "pytest",
     "pyyaml",
+    "jsonschema",
     "redis>=3.3.2",
     # NOTE: Don't upgrade the version of six! Doing so causes installation
     # problems. See https://github.com/ray-project/ray/issues/4169.