Fix handling of metadata, headers. Removes etag from getState.

[artursouza]

Description

Fix handling of metadata, headers.
Removes etag from getState.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #439 #396

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

Merging #440 (0991195) into master (76d877c) will increase coverage by 0.01%.
The diff coverage is 86.66%.

@@             Coverage Diff              @@
##             master     #440      +/-   ##
============================================
+ Coverage     83.30%   83.32%   +0.01%     
+ Complexity      859      858       -1     
============================================
  Files            74       74              
  Lines          2540     2548       +8     
  Branches        256      259       +3     
============================================
+ Hits           2116     2123       +7     
+ Misses          302      299       -3     
- Partials        122      126       +4     

Impacted Files	Coverage Δ	Complexity Δ
...in/java/io/dapr/client/domain/GetStateRequest.java	100.00% <ø> (ø)	12.00 <0.00> (-2.00)
.../io/dapr/client/domain/GetStateRequestBuilder.java	82.35% <ø> (-2.65%)	4.00 <0.00> (-1.00)
...va/io/dapr/client/domain/InvokeServiceRequest.java	100.00% <ø> (+4.54%)	13.00 <0.00> (-1.00)	⬆️
...apr/client/domain/InvokeServiceRequestBuilder.java	90.47% <ø> (-1.53%)	5.00 <0.00> (-2.00)
...c/main/java/io/dapr/client/AbstractDaprClient.java	89.55% <40.00%> (-0.31%)	33.00 <2.00> (ø)
...k/src/main/java/io/dapr/client/DaprClientGrpc.java	82.97% <73.33%> (-0.31%)	94.00 <0.00> (ø)
...main/java/io/dapr/client/domain/HttpExtension.java	95.23% <94.44%> (+8.87%)	8.00 <6.00> (+3.00)
...k/src/main/java/io/dapr/client/DaprClientHttp.java	91.85% <94.59%> (-0.22%)	82.00 <4.00> (+2.00)	⬇️

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[mukundansundar]

@artursouza @yaron2 We need to validate whether the metadata is being passed correctly in other SDKs as well.