chore: polish Postman API helper classes and cache management

[tangcent]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 68.83117% with 24 lines in your changes missing coverage. Please review.

Project coverage is 63.365%. Comparing base (1c082c8) to head (b525f8d).

Additional details and impacted files

@@               Coverage Diff               @@
##              master      #547       +/-   ##
===============================================
- Coverage     63.475%   63.365%   -0.109%     
+ Complexity      2011      2010        -1     
===============================================
  Files            224       224               
  Lines          10620     10591       -29     
  Branches        2581      2574        -7     
===============================================
- Hits            6741      6711       -30     
- Misses          2539      2540        +1     
  Partials        1340      1340               

Flag	Coverage Δ
unittests	63.365% <68.831%> (-0.109%)	⬇️

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Files	Coverage Δ
...c/main/kotlin/com/itangcent/cache/CacheSwitcher.kt	100.000% <ø> (ø)
...idea/plugin/api/export/postman/PostmanApiHelper.kt	78.947% <ø> (ø)
...lugin/api/export/postman/PostmanCachedApiHelper.kt	62.857% <71.429%> (-0.830%)	⬇️
...ugin/api/export/postman/DefaultPostmanApiHelper.kt	65.297% <67.857%> (-3.965%)	⬇️

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