fix: not infer methods that return an interface type

[tangcent]

fix #513

[codecov-commenter]

Codecov Report

Merging #518 (c23815d) into master (13e9973) will decrease coverage by 0.002%.
The diff coverage is 29.412%.

@@               Coverage Diff               @@
##              master      #518       +/-   ##
===============================================
- Coverage     39.509%   39.507%   -0.002%     
  Complexity      1489      1489               
===============================================
  Files            197       197               
  Lines          11486     11484        -2     
  Branches        2580      2577        -3     
===============================================
- Hits            4538      4537        -1     
- Misses          5959      5961        +2     
+ Partials         989       986        -3     

Flag	Coverage Δ
unittests	39.507% <29.412%> (-0.002%)	⬇️

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Impacted Files	Coverage Δ
...com/itangcent/idea/plugin/rule/ScriptRuleParser.kt	47.619% <0.000%> (+0.161%)	⬆️
...dea/plugin/api/export/core/RequestClassExporter.kt	51.980% <26.667%> (+0.375%)	⬆️
...lin/com/itangcent/idea/plugin/settings/Settings.kt	70.866% <100.000%> (ø)
...pi/export/generic/GenericMethodDocClassExporter.kt	47.727% <0.000%> (-1.515%)	⬇️

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