Expose context to storage strategy methods.

[angelnikolov]

Fixes #102
@KG3RK3N Will this work for you?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@f48b15e). Click here to learn what that means.
The diff coverage is 57.14%.

@@            Coverage Diff            @@
##             master     #105   +/-   ##
=========================================
  Coverage          ?   75.80%           
=========================================
  Files             ?       12           
  Lines             ?      310           
  Branches          ?       80           
=========================================
  Hits              ?      235           
  Misses            ?       60           
  Partials          ?       15           

Impacted Files	Coverage Δ
common/IAsyncStorageStrategy.ts	100.00% <ø> (ø)
common/IStorageStrategy.ts	100.00% <ø> (ø)
cacheable.decorator.ts	93.33% <50.00%> (ø)
promise.cacheable.decorator.ts	90.00% <50.00%> (ø)
common/InMemoryStorageStrategy.ts	86.36% <100.00%> (ø)

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[KG3RK3N]

Yes, it works fine 👍