feat: Support configuring doc.source.disable to disable documentation reading

[tangcent]

close #1055

[codecov]

Codecov Report

Merging #1059 (f79a32f) into master (43f649d) will increase coverage by 0.017%.
The diff coverage is 72.727%.

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #1059       +/-   ##
===============================================
+ Coverage     62.211%   62.228%   +0.017%     
+ Complexity      2251      2241       -10     
===============================================
  Files            243       244        +1     
  Lines          11858     11874       +16     
  Branches        2918      2925        +7     
===============================================
+ Hits            7377      7389       +12     
  Misses          2915      2915               
- Partials        1566      1570        +4     

Flag	Coverage Δ
unittests	62.228% <72.727%> (+0.017%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...kotlin/com/itangcent/idea/psi/DisableDocSupport.kt	72.727% <72.727%> (ø)

... and 3 files with indirect coverage changes

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