fix/adaptive-service: deadlock caused by rwMutex in limiter mapper

[CoolIceV]

What this PR does:
Fix deadlock caused by rwMutex in limiter mapper.

Which issue(s) this PR fixes:
Fixes #2038

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• All ut passed (run 'go test ./...' in project root)
• After go-fmt ed , run 'go fmt project' using goland.
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• All integration test passed. You can run integration test locally (with docker env). Clone our dubbo-go-samples project and replace the go.mod to your dubbo-go, and run 'sudo sh start_integration_test.sh' at root of samples project root. (M1 Slice is not Support)

[codecov-commenter]

Codecov Report

Merging #2053 (a0503c6) into 3.0 (33a2901) will not change coverage.
The diff coverage is 25.00%.

@@           Coverage Diff           @@
##              3.0    #2053   +/-   ##
=======================================
  Coverage   44.66%   44.66%           
=======================================
  Files         283      283           
  Lines       17108    17108           
=======================================
  Hits         7642     7642           
  Misses       8658     8658           
  Partials      808      808           

Impacted Files	Coverage Δ
config/config_loader.go	17.56% <0.00%> (ø)
config/graceful_shutdown.go	3.88% <0.00%> (ø)
config/service_config.go	53.04% <0.00%> (ø)
registry/protocol/protocol.go	72.10% <100.00%> (ø)

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