Fixed DaprBindingMessage JsonElement.ValueKind string issue

[ASHIQUEMD]

Current issue: When DaprServiceInvocation is called using DaprInvokeOutput binding, it sends JsonElement data as JsonElement.ValueKind = string, which results in exception (The requested operation requires an element of type 'Object', but the target element has type 'String'.)

This change will support both value kind Object and String.

[codecov[bot]]

Codecov Report

Merging #130 (e4fb7eb) into master (1744050) will increase coverage by 0.27%. Report is 1 commits behind head on master. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #130      +/-   ##
==========================================
+ Coverage   71.69%   71.97%   +0.27%     
==========================================
  Files          51       51              
  Lines        1007     1017      +10     
==========================================
+ Hits          722      732      +10     
  Misses        285      285              

Files Changed	Coverage Δ
...obs.Extensions.Dapr/DaprExtensionConfigProvider.cs	72.02% <100.00%> (+2.10%)	:arrow_up: