[ISSUE #3949] return acceptMessageTypes for querying topic route.

[lollipopjin]

Make sure set the target branch to develop

What is the purpose of the change

In proxy model, return acceptMessageTypes for querying topic route.

Brief changelog

In proxy model, return acceptMessageTypes, which is already stored in TopicConfig.

Verifying this change

XXXX

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[codecov-commenter]

Codecov Report

Merging #4691 (64a94b9) into develop (3602b45) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             develop    #4691      +/-   ##
=============================================
+ Coverage      44.59%   44.61%   +0.01%     
+ Complexity      7522     7519       -3     
=============================================
  Files            977      977              
  Lines          67582    67593      +11     
  Branches        8927     8927              
=============================================
+ Hits           30138    30154      +16     
+ Misses         33726    33718       -8     
- Partials        3718     3721       +3     

Impacted Files	Coverage Δ
...g/apache/rocketmq/common/message/MessageConst.java	98.03% <100.00%> (+0.03%)	⬆️
...he/rocketmq/proxy/grpc/v2/route/RouteActivity.java	91.94% <100.00%> (+0.57%)	⬆️
...rg/apache/rocketmq/common/stats/StatsSnapshot.java	84.61% <0.00%> (-15.39%)	⬇️
.../apache/rocketmq/common/stats/MomentStatsItem.java	38.09% <0.00%> (-9.53%)	⬇️
...ache/rocketmq/common/stats/MomentStatsItemSet.java	39.13% <0.00%> (-8.70%)	⬇️
...va/org/apache/rocketmq/common/stats/StatsItem.java	50.00% <0.00%> (-5.00%)	⬇️
...org/apache/rocketmq/common/stats/StatsItemSet.java	41.79% <0.00%> (-2.99%)	⬇️
...ache/rocketmq/broker/client/ConsumerGroupInfo.java	68.46% <0.00%> (-0.91%)	⬇️
...he/rocketmq/client/trace/AsyncTraceDispatcher.java	82.85% <0.00%> (-0.48%)	⬇️
...cketmq/broker/schedule/ScheduleMessageService.java	57.61% <0.00%> (-0.47%)	⬇️
... and 9 more

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[coveralls]

Coverage increased (+0.02%) to 48.833% when pulling 64a94b9 on lollipopjin:develop into 3602b45 on apache:develop.

[zhouxinyu]

LGTM～