fix: add nacos methods key

[LaurenceLiZhixin]

• nacos registry servicce provider's url methods key is empty now, and is used by pixiu-gateway

[codecov-commenter]

Codecov Report

Merging #1608 (8e87f98) into 3.0 (7d08891) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.0    #1608      +/-   ##
==========================================
- Coverage   41.00%   40.98%   -0.03%     
==========================================
  Files         251      251              
  Lines       14402    14403       +1     
==========================================
- Hits         5906     5903       -3     
- Misses       7813     7818       +5     
+ Partials      683      682       -1     

Impacted Files	Coverage Δ
registry/nacos/registry.go	48.55% <100.00%> (+0.37%)	⬆️
metrics/prometheus/reporter.go	26.85% <0.00%> (-1.72%)	⬇️
metadata/report/delegate/delegate_report.go	34.43% <0.00%> (-0.67%)	⬇️

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[binbin0325]

LGTM