[INLONG-1769][TubeMQ]Fix bug in util function SplitToMap in Go SDK

[TszKitLo40]

Signed-off-by: Zijie Lu wslzj40@gmail.com

Title Name: [INLONG-XYZ][component] Title of the pull request

where XYZ should be replaced by the actual issue number.

Fixes #1769

Motivation

Explain here the context, and why you're making that change. What is the problem you're trying to solve.
Fix panic in SplitToMap

Modifications

Describe the modifications you've done.
Use builtin function to implement SplitToMap

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

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• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[codecov-commenter]

Codecov Report

Merging #1770 (103d3b5) into master (209bc63) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1770      +/-   ##
============================================
- Coverage     12.22%   12.21%   -0.01%     
+ Complexity     1050     1049       -1     
============================================
  Files           392      392              
  Lines         32764    32764              
  Branches       5157     5157              
============================================
- Hits           4004     4002       -2     
- Misses        27996    27998       +2     
  Partials        764      764              

Impacted Files	Coverage Δ
.../inlong/tubemq/corebase/policies/FlowCtrlItem.java	38.88% <0.00%> (-1.12%)	⬇️
.../tubemq/corebase/policies/FlowCtrlRuleHandler.java	34.07% <0.00%> (-0.45%)	⬇️
.../producer/qltystats/DefaultBrokerRcvQltyStats.java	45.70% <0.00%> (+0.39%)	⬆️

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[gosonzhang]

+1