add Endpoint default constructor.

[sh1yu]

What is the purpose of the change

fix the Endpoint constructor error during Consumer start with FORCE_APPLICATION.
this place need default Endpoint constructor:

dubbo/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/DefaultServiceInstance.java

Line 186 in 2e8dca6

return JSON.parseArray(metadata.get(ENDPOINTS), Endpoint.class);

Brief changelog

1. add Endpoint default constructor.

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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• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
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• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Merging #8277 (d2447b1) into 3.0 (2e8dca6) will decrease coverage by 0.15%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                3.0    #8277      +/-   ##
============================================
- Coverage     64.05%   63.90%   -0.16%     
+ Complexity      312      310       -2     
============================================
  Files          1073     1073              
  Lines         45274    45276       +2     
  Branches       6814     6814              
============================================
- Hits          28999    28932      -67     
- Misses        13056    13118      +62     
- Partials       3219     3226       +7     

Impacted Files	Coverage Δ
.../dubbo/registry/client/DefaultServiceInstance.java	74.54% <100.00%> (+4.17%)	⬆️
...ache/dubbo/remoting/transport/AbstractChannel.java	37.50% <0.00%> (-37.50%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	68.96% <0.00%> (-27.59%)	⬇️
...dubbo/common/status/support/LoadStatusChecker.java	46.15% <0.00%> (-15.39%)	⬇️
...ng/transport/dispatcher/WrappedChannelHandler.java	47.82% <0.00%> (-15.22%)	⬇️
.../remoting/transport/netty4/NettyClientHandler.java	61.01% <0.00%> (-6.78%)	⬇️
...he/dubbo/registry/multicast/MulticastRegistry.java	63.42% <0.00%> (-5.10%)	⬇️
...ubbo/rpc/protocol/dubbo/ChannelWrappedInvoker.java	43.47% <0.00%> (-4.35%)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0.00%> (-4.35%)	⬇️
...etadata/report/support/AbstractMetadataReport.java	57.89% <0.00%> (-3.83%)	⬇️
... and 16 more

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