EurekaEndpointGroup add InstanceInfo to endpoint attributes.

[eisig]

Motivation:

As discuss in https://github.com/line/armeria/pull/3980. Add eureka InstanceInfo to endpoint attrs. so we can get the eureka metadatas.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.47%. Comparing base (ef56494) to head (a22f120). Report is 803 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4243      +/-   ##
============================================
+ Coverage     73.37%   73.47%   +0.09%     
- Complexity    16983    17509     +526     
============================================
  Files          1451     1493      +42     
  Lines         64034    65663    +1629     
  Branches       8039     8256     +217     
============================================
+ Hits          46987    48243    +1256     
- Misses        12958    13228     +270     
- Partials       4089     4192     +103     

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[trustin]

Gentle ping, @eisig 🙇