MRC-601: refactor worker

[richfitz]

• verbosity should be a property of the worker
• there are more pipelineable commands
• we should not query redis for our own active task

These bookkeeping changes underly mrc-600 and mrc-558 but make them harder to understand if not done separately

[codecov[bot]]

Codecov Report

Merging #10 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #10   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          16     16           
  Lines         955    971   +16     
=====================================
+ Hits          955    971   +16

Impacted Files	Coverage Δ
R/worker.R	100% <100%> (ø)	:arrow_up:
R/utils_assert.R	100% <100%> (ø)	:arrow_up:
R/worker_run.R	100% <100%> (ø)	:arrow_up:
R/worker_runner.R	100% <100%> (ø)	:arrow_up:
R/rrq_controller.R	100% <100%> (ø)	:arrow_up:
R/heartbeat.R	100% <100%> (ø)	:arrow_up:
R/worker_config.R	100% <100%> (ø)	:arrow_up:

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