[ISSUE #7642] Add return value for sendHeartbeat related method

[drpmma]

Add sendHeartbeatToBroker

Which Issue(s) This PR Fixes

Fixes #7642

Brief Description

Add return value for sendHeartbeat related method

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: 96 lines in your changes are missing coverage. Please review.

Comparison is base (c2c29c2) 43.20% compared to head (87c733a) 43.17%.
Report is 7 commits behind head on develop.

Files	Patch %	Lines
...rocketmq/client/impl/factory/MQClientInstance.java	4.54%	84 Missing ⚠️
...apache/rocketmq/store/timer/TimerMessageStore.java	20.00%	4 Missing ⚠️
...apache/rocketmq/broker/slave/SlaveSynchronize.java	0.00%	3 Missing ⚠️
...pache/rocketmq/common/message/MessageAccessor.java	0.00%	3 Missing ⚠️
...lient/impl/consumer/DefaultMQPushConsumerImpl.java	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #7643      +/-   ##
=============================================
- Coverage      43.20%   43.17%   -0.03%     
- Complexity      9796     9806      +10     
=============================================
  Files           1164     1164              
  Lines          84420    84456      +36     
  Branches       10961    10967       +6     
=============================================
- Hits           36474    36465       -9     
- Misses         43420    43476      +56     
+ Partials        4526     4515      -11     

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[dingshuangxi888]

LGTM

[joeCarf]

LGTM