bugfix: xid header lowercase

[jsbxyyx]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

fixes #1728

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1789 into develop will increase coverage by <.01%.
The diff coverage is 66.66%.

@@              Coverage Diff              @@
##             develop    #1789      +/-   ##
=============================================
+ Coverage      55.27%   55.28%   +<.01%     
- Complexity      2383     2386       +3     
=============================================
  Files            422      422              
  Lines          14282    14299      +17     
  Branches        1698     1702       +4     
=============================================
+ Hits            7895     7905      +10     
- Misses          5673     5678       +5     
- Partials         714      716       +2

Impacted Files	Coverage Δ	Complexity Δ
...ta/integration/grpc/interceptor/GrpcHeaderKey.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...terceptor/server/ServerTransactionInterceptor.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...eata/integration/motan/MotanTransactionFilter.java	67.85% <100%> (+5.35%)	7 <2> (+2)	⬆️
...ion/sofa/rpc/TransactionContextProviderFilter.java	60% <100%> (+6.15%)	7 <2> (+2)	⬆️
...ion/sofa/rpc/TransactionContextConsumerFilter.java	40% <80%> (+5.38%)	5 <1> (+1)	⬆️
...in/java/io/seata/server/session/GlobalSession.java	84.54% <0%> (-0.49%)	67% <0%> (-1%)
...o/seata/server/coordinator/DefaultCoordinator.java	48.01% <0%> (-0.4%)	27% <0%> (-1%)
...server/store/file/FileTransactionStoreManager.java	56.96% <0%> (+0.31%)	29% <0%> (ø)	⬇️

[xingfudeshi]

LGTM.

[slievrly]

@jsbxyyx Are there any other better options? If the consumer and provider do not use the same version after modification, the compatibility issue will be triggered.

[jsbxyyx]

@slievrly For the old version, it seems that there is no good solution.

[slievrly]

I researched the dubbo community and confirmed whether it is a bug. I think I need to be compatible with the previous version. I think I can make two judgments in the filter.

[slievrly]

Are other rpc frameworks unaffected?

[jsbxyyx]

fix done

[slievrly]

LGTM

[slievrly]

apache/dubbo#5253 (comment)