Update devfile api to include global attributes

[amisevsk]

What does this PR do?

Updates devfile/api dependency and CRDs to devfile/api@ff3c01b

This commit includes support for global attributes and variable replacement (though variable replacement is not yet implemented in the DevWorkspace Operator -- see #408)

What issues does this PR fix or reference?

Add support for top-level attributes in DevWorkspaces

Is it tested? How?

You can test the changes using the yaml

cat <<EOF | kubectl apply -f -
kind: DevWorkspace
apiVersion: workspace.devfile.io/v1alpha2
metadata:
  name: theia-next
spec:
  started: true
  template:
    attributes:
      test-2:
        this: is
        a: map
        of:
          free-form:
            attributes
    components:
      - name: theia
        plugin:
          uri: https://che-plugin-registry-main.surge.sh/v3/plugins/eclipse/che-theia/next/devfile.yaml
EOF

[openshift-ci]

@amisevsk: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/v7-devworkspace-happy-path	ac42a4b	link	/test v7-devworkspace-happy-path

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[benoitf]

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[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amisevsk, benoitf, JPinkney

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