feat: oclif/plugin-help version 3

[chadian]

This pull request will add be considered a breaking change and bump oclif/plugin-help to version3. It includes:

• custom help classes
• re-worked Help class for easier extensibility
• splitting children previously under the COMMANDS list into separate TOPICS and COMMANDS lists

[codecov]

Codecov Report

Merging #64 into master will increase coverage by 9.04%.
The diff coverage is 87.75%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   74.53%   83.58%   +9.04%     
==========================================
  Files           7        8       +1     
  Lines         271      335      +64     
  Branches       81       88       +7     
==========================================
+ Hits          202      280      +78     
+ Misses         32       22      -10     
+ Partials       37       33       -4     

Impacted Files	Coverage Δ
src/command.ts	89.33% <ø> (+2.66%)	⬆️
src/_test-help-class.ts	42.85% <42.85%> (ø)
src/commands/help.ts	66.66% <50.00%> (-6.67%)	⬇️
src/index.ts	90.82% <91.66%> (+26.93%)	⬆️
src/util.ts	92.85% <94.11%> (+0.85%)	⬆️
src/list.ts	78.43% <0.00%> (+1.96%)	⬆️
... and 1 more

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[RasPhilCo]

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