[ISSUE #429] Registration & Heartbeat Performance Optimization

[chuntaojun]

Please provide issue(s) of this PR:
Fixes #429

To help us figure out who should review this PR, please put an X in all the areas that this PR affects.

• Configuration
• Docs
• Installation
• Performance and Scalability
• Naming
• HealthCheck
• Test and Release

Please check any characteristics that apply to this pull request.

• Does not have any user-facing changes. This may include API changes, behavior changes, performance improvements, etc.

[codecov]

Codecov Report

Merging #440 (7072fa2) into main (4632805) will increase coverage by 1.04%.
The diff coverage is 51.70%.

❗ Current head 7072fa2 differs from pull request most recent head 3fd9127. Consider uploading reports for the commit 3fd9127 to get more accurate results

@@            Coverage Diff             @@
##             main     #440      +/-   ##
==========================================
+ Coverage   22.17%   23.21%   +1.04%     
==========================================
  Files         185      186       +1     
  Lines       25159    25189      +30     
==========================================
+ Hits         5578     5848     +270     
+ Misses      18738    18441     -297     
- Partials      843      900      +57     

Impacted Files	Coverage Δ
auth/defaultauth/server.go	2.23% <ø> (ø)
auth/defaultauth/server_authability.go	10.00% <0.00%> (ø)
cache/client.go	13.38% <0.00%> (ø)
cache/l5.go	12.04% <0.00%> (ø)
cache/namespace.go	27.41% <0.00%> (ø)
cache/routing_config.go	26.41% <0.00%> (ø)
cache/service_query.go	42.13% <0.00%> (ø)
cache/test_export.go	50.00% <ø> (ø)
config/server.go	0.00% <ø> (ø)
service/batch/future.go	51.61% <0.00%> (-15.06%)	⬇️
... and 27 more

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[andrewshan]

LGTM