Validation of arrays and objects

[m-mohr]

Currently, arrays and objects are not properly validated (see validateArgument in process.js). This is due to the fact that the JSON schemas can't handle our proprietary process graph variables or other custom types (from_node, from_argument). To solve this issue, we need a solution for Open-EO/openeo-api#183

[m-mohr]

Check Open-EO/openeo-api#183 (comment) for a solution.

[m-mohr]

For a bit of coverage we can use ProcessUtils.getElementSchema and validate elements against the sub schemas.

[m-mohr]

Basic validation is now available.