[3.0 triple] Optimize tri header constant & avoid tri header in attachments

[EarthChen]

What is the purpose of the change

Optimize tri header constant & avoid tri header in attachments

Brief changelog

• change tri constant to enum
• Unified processing of attachment value & Determine whether it is larger than the default header size

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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[codecov-commenter]

Codecov Report

Merging #8481 (8652be1) into 3.0 (08eb01b) will decrease coverage by 0.01%.
The diff coverage is 50.98%.

@@             Coverage Diff              @@
##                3.0    #8481      +/-   ##
============================================
- Coverage     62.87%   62.85%   -0.02%     
- Complexity      312      313       +1     
============================================
  Files          1112     1113       +1     
  Lines         46620    46654      +34     
  Branches       7012     7017       +5     
============================================
+ Hits          29311    29324      +13     
- Misses        14050    14069      +19     
- Partials       3259     3261       +2     

Impacted Files	Coverage Δ
...rg/apache/dubbo/rpc/protocol/tri/ServerStream.java	0.00% <0.00%> (ø)
...protocol/tri/TripleHttp2ClientResponseHandler.java	41.02% <0.00%> (ø)
.../org/apache/dubbo/rpc/protocol/tri/TripleUtil.java	35.09% <0.00%> (-0.24%)	⬇️
.../apache/dubbo/rpc/protocol/tri/AbstractStream.java	38.55% <10.00%> (-6.91%)	⬇️
...ache/dubbo/rpc/protocol/tri/UnaryClientStream.java	25.42% <16.66%> (+0.83%)	⬆️
...pc/protocol/tri/TripleHttp2FrameServerHandler.java	39.44% <33.33%> (ø)
...pache/dubbo/rpc/protocol/tri/TripleHeaderEnum.java	91.89% <91.89%> (ø)
...e/dubbo/rpc/protocol/tri/AbstractClientStream.java	58.44% <100.00%> (-2.06%)	⬇️
...e/dubbo/rpc/protocol/tri/AbstractServerStream.java	52.87% <100.00%> (-4.86%)	⬇️
...ubbo/rpc/protocol/tri/ClientTransportObserver.java	82.97% <100.00%> (ø)
... and 15 more

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[twz007]

@EarthChen Hi, I would like to know why "remote.application" was replaced with "tri-consumer-appname", now it seems that there is a bug caused by this change. #11044