add metadata in get bulk state request

[skyao]

Description

Add metadata filed in get bulk state request.

Issue reference

#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

[artursouza]

LGTM. Please, update unit tests to use metadata and keep code coverage.

[mukundansundar]

LGTM. Please, update unit tests to use metadata and keep code coverage.

@skyao can you look into this comment and add tests.
The PR is much appreciated 💯

[skyao]

LGTM. Please, update unit tests to use metadata and keep code coverage.

@skyao can you look into this comment and add tests.
The PR is much appreciated 💯

Unit test updated. Help to review this PR again.

Thanks.

[codecov]

Codecov Report

Merging #401 (c55240a) into master (08f133d) will decrease coverage by 0.06%.
The diff coverage is 62.50%.

@@             Coverage Diff              @@
##             master     #401      +/-   ##
============================================
- Coverage     83.52%   83.46%   -0.07%     
- Complexity      838      841       +3     
============================================
  Files            72       72              
  Lines          2489     2497       +8     
  Branches        259      260       +1     
============================================
+ Hits           2079     2084       +5     
- Misses          286      287       +1     
- Partials        124      126       +2     

Impacted Files	Coverage Δ	Complexity Δ
...k/src/main/java/io/dapr/client/DaprClientGrpc.java	85.23% <0.00%> (-0.58%)	86.00 <0.00> (ø)
...dapr/client/domain/GetBulkStateRequestBuilder.java	81.81% <66.66%> (-2.40%)	4.00 <1.00> (+1.00)	⬇️
...ava/io/dapr/client/domain/GetBulkStateRequest.java	100.00% <100.00%> (ø)	11.00 <2.00> (+2.00)

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