This PR adds a `filterfuzz` subcommand to the workload tester that
generates requests similarly to `filtergen` (though with a much smaller
block length limit) and also verifies the results by retrieving all
block receipts in the range and locally filtering out relevant results.
Unlike `filtergen` that operates on the finalized chain range only,
`filterfuzz` does check the head region, actually it seeds a new query
at every new chain head.
This pull request introduces a new test suite in workload framework, for
transaction tracing.
**test generation**
`go run . tracegen --trace-tests trace-test.json http://host:8545`
and you can choose to store the trace result in a specific folder
`go run . tracegen --trace-tests trace-test.json --trace-output
./trace-result http://host:8545`
**test run**
`./workload test -run Trace/Transaction --trace-invalid ./trace-invalid
http://host:8545`
The mismatched trace result will be saved in the specific folder for
further investigation.
