Add JSON schema for CWL and conformance tests validating it

[fmigneault]

Changes

• Adds CWL JSON schema
• Adds test suite to GitHub Actions CI with pytest to validate the JSON schema against conformance test items
• Fix minor indentation issues in run_test.sh

References

• Closes https://github.com/common-workflow-language/cwl-v1.2/issues/253
• Closes https://github.com/common-workflow-language/cwl-v1.2/issues/251 (2 failing test cases)
• Relates to https://github.com/opengeospatial/ogcapi-processes/pull/327
• Relates to https://github.com/opengeospatial/ogcapi-processes/pull/329

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[fmigneault]

@mr-c Is there anything left to be done for this PR?

[mr-c]

@mr-c Is there anything left to be done for this PR?

Hmm. Do you know why the tests aren't running?

https://github.com/common-workflow-language/cwl-v1.2/actions/runs/5543764240/jobs/10120239133#step:8:1

[fmigneault]

@mr-c Everything works now except the 2 tests related to https://github.com/common-workflow-language/cwl-v1.2/issues/251

[fmigneault]

@mr-c Adjusted and passing! 🚀

[fmigneault]

@mr-c I think the time limit recently introduced might cause a problem because I add a whole set of tests for the JSON schema. https://github.com/common-workflow-language/cwl-v1.2/commit/c2ac7e32b1cfc83f2513bdcddd9c528cc572d719

The error in 32e595a is caused by something else completely unrelated to passing test in 56ebd34

[fmigneault]

@mr-c Thanks!