Parquet/Arrow/JSON/HTML plugins; code-only linting support

[zgornel]

• fixes Add Parquet plugin for DataInterface #75
• fixes Add Arrow plugin for DataInterface #77
• fixes Add Text plugin for OutputInterface #60
• fixes Add JSON plugin for OutputInterface #53
• fixes Add HTML plugin for OutputInterface #79
• fixes Add code-only linting support #80
• LinterCore performance tweaks #64 Dropped
• (OPTIONAL) fixes Revise importance mechanism and linter levels #74

[codecov]

Codecov Report

❌ Patch coverage is 51.77665% with 95 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.73%. Comparing base (3efc3d0) to head (96e936c).

Files with missing lines	Patch %	Lines
src/plugins/output/text.jl	46.15%	28 Missing ⚠️
src/plugins/output/html.jl	0.00%	18 Missing ⚠️
src/data.jl	66.00%	17 Missing ⚠️
src/plugins/output/json.jl	0.00%	17 Missing ⚠️
src/output.jl	36.84%	12 Missing ⚠️
src/linter.jl	96.42%	1 Missing ⚠️
src/plugins/data/csv.jl	75.00%	1 Missing ⚠️
src/workflows.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
- Coverage   60.59%   59.73%   -0.87%     
==========================================
  Files          10       14       +4     
  Lines         368      447      +79     
==========================================
+ Hits          223      267      +44     
- Misses        145      180      +35     

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