Add check for faulted task in AsyncInterceptor

[ladenedge]

See #52. This PR adds a check to task.IsFaulted in the post-invoke continuations for the AsyncInterceptor. Exceptions can then be handled via HandleException() rather than throwing when the task.Result is accessed on a faulted task.

Full unit tests are included.

[codecov-io]

Codecov Report

Merging #53 into master will decrease coverage by 1.32%.
The diff coverage is 90.56%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage   72.65%   71.32%   -1.33%     
==========================================
  Files          48       45       -3     
  Lines         969      959      -10     
  Branches        0      156     +156     
==========================================
- Hits          704      684      -20     
+ Misses        265      226      -39     
- Partials        0       49      +49

Impacted Files	Coverage Δ
...inject.Extensions.Interception/AsyncInterceptor.cs	89.47% <90.56%> (+2.23%)	⬆️
...t.Extensions.Interception/Infrastructure/Ensure.cs	33.33% <0%> (-33.34%)	⬇️
...nsions.Interception/Request/ProxyRequestFactory.cs	33.33% <0%> (-33.34%)	⬇️
...terception/Registry/MethodInterceptorCollection.cs	75% <0%> (-25%)	⬇️
...nterception/Attributes/NotifyOfChangesAttribute.cs	80% <0%> (-20%)	⬇️
...eption/Infrastructure/Language/KernelExtensions.cs	77.5% <0%> (-13.75%)	⬇️
....Extensions.Interception.DynamicProxy/ProxyBase.cs	73.33% <0%> (-13.34%)	⬇️
...Infrastructure/Language/ExtensionsForMethodInfo.cs	77.77% <0%> (-11.12%)	⬇️
...erception.DynamicProxy/DynamicProxyProxyFactory.cs	81.08% <0%> (-10.82%)	⬇️
...trategies/MethodInterceptorRegistrationStrategy.cs	85% <0%> (-10%)	⬇️
... and 15 more

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[EugeneKrapivin]

will anyone event merge this branch? it seem lgtm

[scott-xu]

Thanks! @ladenedge