feat: add tracing starters && add zipkin auto configuration

[conghuhu]

What is the purpose of the change

tracing example config:

  tracing:
    enabled: true # default is false
    sampling:
      probability: 0.5 # sampling rate, default is 0.1
    propagation:
      type: W3C # W3C/B3 default is W3C
    tracing-exporter:
      zipkin-config:
        endpoint: http://localhost:9411/api/v2/spans
        connect-timeout: 1s # connect timeout, default is 1s
        read-timeout: 10s # read timeout, default is 10s

Add two types of observ starters:

• dubbo-spring-boot-tracing-otel-zipkin-starter
• dubbo-spring-boot-tracing-brave-zipkin-starter

samples

Brief changelog

Verifying this change

Checklist

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[conghuhu]

@songxiaosheng PTAL

[AlbumenJ]

Introduce a new starter like dubbo-spring-boot-zipkin-starter would be better

[conghuhu]

@songxiaosheng PTAL

[codecov-commenter]

Codecov Report

Merging #12013 (d4d9358) into 3.2 (736d996) will decrease coverage by 0.58%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.2   #12013      +/-   ##
============================================
- Coverage     70.02%   69.44%   -0.58%     
+ Complexity      339        2     -337     
============================================
  Files          1802     1589     -213     
  Lines         93710    65330   -28380     
  Branches      17012     9513    -7499     
============================================
- Hits          65620    45370   -20250     
+ Misses        22775    15592    -7183     
+ Partials       5315     4368     -947     

see 3391 files with indirect coverage changes

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[songxiaosheng]

LGTM

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
17 Code Smells

1.1% Coverage
0.0% Duplication