Add SetCacheDir API to customize disk cache directory.

[fengdyli]

Add SetCacheDir API to customize disk cache directory.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 60.86957% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.97%. Comparing base (18befa6) to head (b5c16c3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/rendering/caches/DiskCache.cpp	60.86%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3194   +/-   ##
=======================================
  Coverage   76.97%   76.97%           
=======================================
  Files         413      413           
  Lines       21910    21930   +20     
  Branches     6291     6302   +11     
=======================================
+ Hits        16865    16881   +16     
- Misses       3819     3824    +5     
+ Partials     1226     1225    -1     

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[shlzxjp]

看了下checkInitialized方法应该没必要，缓存路径初始化的逻辑放在构造方法中就行，这样就不用每个函数调用前都需要去调用一下checkInitialized方法了，后续增加新的方法可能会漏了调用，增加维护成本。