Encapsulation of hash tables

[wlandau]

Summary

Previously, the decorated storr had public hash tables and expected external functions to use them. Now, those hash tables can be accessed entirely with easier-to-use methods in the decorated storr itself. Encapsulation +1.

Related GitHub issues and pull requests

• Ref: Encapsulated encoders #968

Checklist

• I understand and agree to drake's code of conduct.
• I have listed any substantial changes in the development news.
• I have added testthat unit tests to tests/testthat for any new functionality.
• This pull request is not a draft.

[codecov-io]

Codecov Report

Merging #1011 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1011   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files          47      46    -1     
  Lines        6419    6422    +3     
======================================
+ Hits         6419    6422    +3

Impacted Files	Coverage Δ
R/drake_config.R	100% <ø> (ø)	⬆️
R/clean.R	100% <100%> (ø)	⬆️
R/analyze_code.R	100% <100%> (ø)	⬆️
R/text_drake_graph.R	100% <100%> (ø)	⬆️
R/deprecated.R	100% <100%> (ø)	⬆️
R/cache.R	100% <100%> (ø)	⬆️
R/deps.R	100% <100%> (ø)	⬆️
R/decorate_storr.R	100% <100%> (ø)	⬆️
R/local_build.R	100% <100%> (ø)	⬆️
R/make.R	100% <100%> (ø)	⬆️
... and 9 more

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