Add common processor fields

[renanbr]

Add common fields^1,2 to all processors:

• tag
• on_failure
• ignore_failure
• if

¹ https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest-processors.html ² https://www.elastic.co/guide/en/elasticsearch/reference/current/handling-failure-in-pipelines.html

[renanbr]

It's only a proposal for now. If this is accepted, we may want to add some functional tests and update CHANGELOG.md

[ruflin]

+1 on having this as it is in all processors. Didn't check the code yet.