support SharedPreferencesWithCache and SharedPreferencesAsync.

[hoc081098]

issue #75

[codecov]

Codecov Report

Attention: Patch coverage is 85.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 92.85%. Comparing base (3c3e491) to head (b1d3cf0).
Report is 5 commits behind head on master.

Files	Patch %	Lines
...l/async/shared_preferences_with_cache_adapter.dart	83.33%	8 Missing ⚠️
...c/impl/async/shared_preferences_async_adapter.dart	80.00%	7 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (3c3e491) and HEAD (b1d3cf0). Click for more details.

HEAD has 54 uploads less than BASE

Flag	BASE (3c3e491)	HEAD (b1d3cf0)
	55	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage   98.02%   92.85%   -5.17%     
==========================================
  Files           9       11       +2     
  Lines         152      252     +100     
==========================================
+ Hits          149      234      +85     
- Misses          3       18      +15     

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