0.5.0 checked refactor

[maksymiuks]

Complete overhaul of the package. Thanks @dgkf for an excellent job on it! We need to merge it today, else checked will be taken down from CRAN

[codecov]

Codecov Report

❌ Patch coverage is 83.51425% with 243 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.32%. Comparing base (3615af8) to head (3000f2a).

Files with missing lines	Patch %	Lines
R/remotes.R	40.29%	40 Missing ⚠️
R/pkg_origin.R	68.80%	34 Missing ⚠️
R/results.R	69.07%	30 Missing ⚠️
R/reporter_ansi_tty.R	89.65%	27 Missing ⚠️
R/plan.R	85.27%	19 Missing ⚠️
R/utils-cli.R	76.38%	17 Missing ⚠️
R/task-formatting.R	31.81%	15 Missing ⚠️
R/utils-paths.R	64.70%	12 Missing ⚠️
R/checker.R	91.02%	7 Missing ⚠️
R/run.R	53.33%	7 Missing ⚠️
... and 14 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   90.27%   83.32%   -6.96%     
==========================================
  Files          21       29       +8     
  Lines        1471     2159     +688     
==========================================
+ Hits         1328     1799     +471     
- Misses        143      360     +217     

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