Add the processing error

[w3nl]

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src/processing-error.js:18

• The method name 'errorStatus' should be renamed to 'status' to maintain consistency with other error classes.

get errorStatus() {

src/tests/processing-error.unit.js:37

• The expected error message 'Invalid error' is not defined in the ProcessingError class. This might be a bug.

assert.deepEqual(error.message, 'Invalid error')