feat(cache): ICacheStore support async

[cipchk]

• close @delon/cache增加IndexedDB存储方式 ng-alain#2602

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[cipchk]

Preview is ready!

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.18%. Comparing base (fa31e23) to head (53ea04a).

Files with missing lines	Patch %	Lines
packages/cache/src/local-storage-cache.service.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #1986    +/-   ##
========================================
  Coverage   95.18%   95.18%            
========================================
  Files         270      270            
  Lines        8765     8772     +7     
  Branches     1705     1813   +108     
========================================
+ Hits         8343     8350     +7     
  Misses        335      335            
  Partials       87       87            

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[AveryZhang]

save方法，应该要能返回异步promise,毕竟底层的存储可能是异步的，不这样做，调用方就不知道何时save完成了。。同理，其它很多方法，可能都要改成返回异步对象才行。甚至，程序刚运行，在打开底层的存储库时，打开方法，也是异步的，如果不等存储库打开完成，就直接读取或者存储，就会报错。

[AveryZhang]

对外公开的方法，如open，set， get，remove clear等方法，可能都要能返回异步结果。