Support New Query Type -- [90+6=99]

[phinaga]

• Links to dataSpecs issue & new query type file
• Add query type (subclass AbiQuery)
• Add sources (subclass DataSource)
• Add feed (instance of DataFeed)
• Add example instance of the query type to catalog
• Add support for building custom instances of the new query type (using the --build-feed flag)
• Tests for new query type, sources, feeds, & additions to the CLI
• Update docs for each addition
• Include example transactions from a block explorer of new query type submitted to Tellor using telliot-feeds

[0xSpuddy]

@phinaga did you have a question, or a telliot-feeds issue that you would like us to look at?