add config to disable namespace stripping to support topics containing '%'

[1782935682]

feat(proxy): add switch to disable automatic namespace stripping

When a topic is named in the format Namespace%Topic (e.g., 111%222), the Proxy previously truncated it to just 222. This caused message send/receive errors and ACL authentication failures due to resource name mismatches.

This commit introduces a configuration option to disable this automatic namespace parsing, allowing topics to retain their full name structure.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 27.27273% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.27%. Comparing base (63d20eb) to head (45fabe3).

Files with missing lines	Patch %	Lines
...e/rocketmq/proxy/grpc/v2/common/GrpcConverter.java	22.22%	12 Missing and 2 partials ⚠️
.../org/apache/rocketmq/proxy/config/ProxyConfig.java	50.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9878      +/-   ##
=============================================
- Coverage      48.39%   48.27%   -0.12%     
+ Complexity     12283    12257      -26     
=============================================
  Files           1314     1314              
  Lines          93903    93921      +18     
  Branches       12046    12047       +1     
=============================================
- Hits           45443    45345      -98     
- Misses         42852    42947      +95     
- Partials        5608     5629      +21     

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[lizhimins]

@qianye1001 @RongtongJin Please consider