Processor Plugins + Filter Processor

[winder]

We created a first draft for the Processor with Local Ledger.

There are a couple small problems. The main one being that it isn't chain-able. The Input data does not equal the Output data, so we can not load more than one of them.

Similar to the Data Exporter epic, we want to test the interface ahead of the full plugin framework. We will build a filtering plugin to test the design and allow setting configuration for it.

• Create RFC
• Update interface
• Update LocalLedger to fit new interface
• Create FilterProcessor, implementing the interface
• Test interoperability between Exporter and Filtered Data
  • does removing data from the StateDelta work with the postgres writer?
• Add configuration file for the filtering config.
  • file should match what we have for Data Exporter and future configuration.