remove strong dep micrometer in tracing

[songxiaosheng]

What is the purpose of the change?

remove strong dep micrometer in tracing
fix pr: #14872

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[AlbumenJ]

Please fix style check

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 60.74%. Comparing base (09d6645) to head (20ca1e0).

Files with missing lines	Patch %	Lines
...apache/dubbo/tracing/DubboObservationRegistry.java	0.00%	8 Missing ⚠️
...apache/dubbo/tracing/metrics/ObservationMeter.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #14986      +/-   ##
============================================
- Coverage     60.75%   60.74%   -0.01%     
- Complexity    10864    10867       +3     
============================================
  Files          1882     1883       +1     
  Lines         86009    86009              
  Branches      12887    12887              
============================================
- Hits          52251    52247       -4     
- Misses        28313    28318       +5     
+ Partials       5445     5444       -1     

Flag	Coverage Δ
integration-tests	33.05% <0.00%> (+<0.01%)	⬆️
samples-tests	29.22% <0.00%> (+<0.01%)	⬆️
unit-tests	58.89% <0.00%> (+<0.01%)	⬆️

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[songxiaosheng]

Please fix style check

fixed

[AlbumenJ]

Can this PR fix that issue?

[songxiaosheng]

Can this PR fix that issue?

yes,we can lazy load micrometer class when it exists: