feat(sermant-springboot-registry): 添加 Nacos 注册中心支持

[xzhaoxz]

What type of PR is this?

spring-boot supports nacos

What this PR does / why we need it?

SpringBoot provides service registration and discovery capabilities for pure SpringBoot applications, enabling users to quickly access the registry without modifying the code

Which issue(s) this PR fixes？

Fixes #

Does this PR introduce a user-facing change?

#1714

[codecov]

Codecov Report

Attention: Patch coverage is 39.27393% with 184 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../sermant/discovery/config/NacosRegisterConfig.java	20.45%	69 Missing and 1 partial ⚠️
...iscovery/nacos/listen/NacosInstanceListenable.java	0.00%	36 Missing ⚠️
...ervice/lb/discovery/nacos/NacosServiceManager.java	59.64%	19 Missing and 4 partials ⚠️
...rvice/lb/discovery/nacos/NacosDiscoveryClient.java	55.10%	21 Missing and 1 partial ⚠️
...a/io/sermant/discovery/entity/RegisterContext.java	32.14%	19 Missing ⚠️
...scovery/service/lb/cache/InstanceCacheManager.java	0.00%	4 Missing ⚠️
...sermant/discovery/service/lb/DiscoveryManager.java	40.00%	1 Missing and 2 partials ⚠️
...scovery/service/lb/rule/NacosWeightRandomRule.java	87.50%	1 Missing and 2 partials ⚠️
...ermant/discovery/config/DiscoveryPluginConfig.java	50.00%	2 Missing ⚠️
...nt/discovery/service/lb/discovery/zk/ZkClient.java	50.00%	0 Missing and 1 partial ⚠️
... and 1 more

Flag	Coverage Δ	Complexity Δ
unittests	43.75% <39.27%> (-0.46%)	181.00 <0.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ	Complexity Δ
...ain/java/io/sermant/discovery/config/LbConfig.java	57.02% <ø> (+0.22%)	0.00 <0.00> (ø)
...java/io/sermant/discovery/config/RegisterType.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...y/service/lb/discovery/InstanceChangeListener.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...ervice/lb/discovery/zk/ZkDiscoveryClientProxy.java	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
...e/lb/discovery/zk/listen/ZkInstanceListenable.java	40.25% <100.00%> (ø)	0.00 <0.00> (ø)
...nt/discovery/service/lb/discovery/zk/ZkClient.java	65.21% <50.00%> (+1.58%)	0.00 <0.00> (ø)
...ery/service/lb/discovery/zk/ZkDiscoveryClient.java	51.20% <0.00%> (ø)	0.00 <0.00> (ø)
...ermant/discovery/config/DiscoveryPluginConfig.java	75.00% <50.00%> (-8.34%)	0.00 <0.00> (ø)
...sermant/discovery/service/lb/DiscoveryManager.java	76.66% <40.00%> (+0.26%)	0.00 <0.00> (ø)
...scovery/service/lb/rule/NacosWeightRandomRule.java	87.50% <87.50%> (ø)	0.00 <0.00> (?)
... and 6 more

... and 164 files with indirect coverage changes