Add CachedMemory type

[Robbepop]

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[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.

Project coverage is 80.44%. Comparing base (8a489cc) to head (495a5e6).

Files	Patch %	Lines
crates/wasmi/src/engine/executor/cache.rs	76.92%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1068      +/-   ##
==========================================
- Coverage   80.44%   80.44%   -0.01%     
==========================================
  Files         268      269       +1     
  Lines       24976    24984       +8     
==========================================
+ Hits        20093    20099       +6     
- Misses       4883     4885       +2     

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