feat(pubsub): add bulk subscribe support

[shubham1172]

Description

NOTE: This PR should be only merged once the bulk pubsub feature (2218) is checked-in Dapr. The Dapr reference in build/validate YAMLs must be updated back to master.

Add a new annotation @BulkSubscribe to allow subscribing to events using the Bulk Subscribe API.

Issue reference

Please reference the issue this PR will close: #778

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

changes addressed.

[mukundansundar]

@shubham1172 One point, potentially BulkPublishEntry in #789 and DaprBulkMessageEntry can be combined. Based on which PR goes in first both domain objects can be combined.
Also do we need to prefix with Dapr on the domain objects? Like DaprBulkMessage ? Can it just be BulkMessage?

[shubham1172]

@shubham1172 One point, potentially BulkPublishEntry in #789 and DaprBulkMessageEntry can be combined. Based on which PR goes in first both domain objects can be combined. Also do we need to prefix with Dapr on the domain objects? Like DaprBulkMessage ? Can it just be BulkMessage?

Thanks Mukundan, I have removed the Dapr prefix from domain objects.

[artursouza]

Resolve the conflicts from master, please. For that, you can just pick the master changes.

[artursouza]

Also, resolve conflicts from master, please.

[codecov]

Codecov Report

Merging #791 (75111a3) into master (b83661d) will increase coverage by 0.48%.
The diff coverage is 54.54%.

@@             Coverage Diff              @@
##             master     #791      +/-   ##
============================================
+ Coverage     77.62%   78.10%   +0.48%     
- Complexity     1161     1190      +29     
============================================
  Files           105      111       +6     
  Lines          3647     3718      +71     
  Branches        419      424       +5     
============================================
+ Hits           2831     2904      +73     
+ Misses          603      597       -6     
- Partials        213      217       +4     

Impacted Files	Coverage Δ
...o/dapr/client/domain/BulkSubscribeAppResponse.java	0.00% <0.00%> (ø)
...r/client/domain/BulkSubscribeAppResponseEntry.java	0.00% <0.00%> (ø)
.../client/domain/BulkSubscribeAppResponseStatus.java	0.00% <0.00%> (ø)
...va/io/dapr/client/domain/BulkSubscribeMessage.java	0.00% <0.00%> (ø)
.../dapr/client/domain/BulkSubscribeMessageEntry.java	0.00% <0.00%> (ø)
...java/io/dapr/springboot/DaprTopicSubscription.java	85.00% <75.00%> (+85.00%)	⬆️
...java/io/dapr/springboot/DaprBeanPostProcessor.java	72.00% <85.00%> (+31.70%)	⬆️
.../src/main/java/io/dapr/springboot/DaprRuntime.java	81.48% <100.00%> (+16.26%)	⬆️
...va/io/dapr/springboot/DaprSubscriptionBuilder.java	48.71% <100.00%> (+13.58%)	⬆️
...ava/io/dapr/springboot/DaprTopicBulkSubscribe.java	100.00% <100.00%> (ø)
... and 4 more

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