router plugin: interceptor with xDS router

[daizhenyu]

What type of PR is this?

Feature.

What this PR does / why we need it?

router plugin: interceptor with xDS router, include:

1. HttpClient4.x
2. OkHttp2.x+
3. HttpUrlConnection
4. SpringCloud

Which issue(s) this PR fixes？

Fixes #1604

Does this PR introduce a user-facing change?

No

Checklist

• [x] Make sure there is a GitHub_issue related with this PR before you start working on it.
• [x] Make sure you have squashed your change to one single commit.
• [ ] GitHub Actions works fine in this PR.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 32.82443% with 176 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...er/spring/interceptor/HttpClient4xInterceptor.java	0.00%	44 Missing :warning:
...terceptor/HttpUrlConnectionConnectInterceptor.java	0.00%	39 Missing :warning:
...r/spring/interceptor/OkHttp3ClientInterceptor.java	0.00%	29 Missing :warning:
...pring/interceptor/BaseLoadBalancerInterceptor.java	45.83%	10 Missing and 3 partials :warning:
...sermant/router/spring/utils/SpringRouterUtils.java	20.00%	11 Missing and 1 partial :warning:
...er/spring/interceptor/LoadBalancerInterceptor.java	31.25%	9 Missing and 2 partials :warning:
...ceptor/ServiceInstanceListSupplierInterceptor.java	31.25%	9 Missing and 2 partials :warning:
...eptor/OkHttpClientInterceptorChainInterceptor.java	75.00%	7 Missing and 2 partials :warning:
...declarer/OkHttpClientInterceptorChainDeclarer.java	0.00%	4 Missing :warning:
.../io/sermant/router/common/config/RouterConfig.java	50.00%	3 Missing :warning:
... and 1 more

Flag	Coverage Δ	Complexity Δ
unittests	44.10% <32.82%> (-0.04%)	182.00 <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
.../router/spring/declarer/OkHttp3ClientDeclarer.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...rmant/router/spring/utils/BaseHttpRouterUtils.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...declarer/BaseRegistryPluginAdaptationDeclarer.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../io/sermant/router/common/config/RouterConfig.java	57.14% <50.00%> (-1.00%)	0.00 <0.00> (ø)
...declarer/OkHttpClientInterceptorChainDeclarer.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...eptor/OkHttpClientInterceptorChainInterceptor.java	75.00% <75.00%> (ø)	0.00 <0.00> (?)
...er/spring/interceptor/LoadBalancerInterceptor.java	61.29% <31.25%> (-32.83%)	0.00 <0.00> (ø)
...ceptor/ServiceInstanceListSupplierInterceptor.java	56.41% <31.25%> (-19.59%)	0.00 <0.00> (ø)
...sermant/router/spring/utils/SpringRouterUtils.java	31.81% <20.00%> (-22.73%)	0.00 <0.00> (ø)
...pring/interceptor/BaseLoadBalancerInterceptor.java	62.50% <45.83%> (-13.02%)	0.00 <0.00> (ø)
... and 3 more

... and 3 files with indirect coverage changes

[Issues-translate-bot]

Detect the issue's language is not English and translate it automatically.

---

Codecov Report

Attention: Patch coverage is 32.82443% with 176 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...er/spring/interceptor/HttpClient4xInterceptor.java	0.00%	44 Missing :warning:
...terceptor/HttpUrlConnectionConnectInterceptor.java	0.00%	39 Missing :warning:
...r/spring/interceptor/OkHttp3ClientInterceptor.java	0.00%	29 Missing :warning:
...pring/interceptor/BaseLoadBalancerInterceptor.java	45.83%	10 Missing and 3 partials :warning:
...sermant/router/spring/utils/SpringRouterUtils.java	20.00%	11 Missing and 1 partial :warning:
...er/spring/interceptor/LoadBalancerInterceptor.java	31.25%	9 Missing and 2 partials :warning:
...ceptor/ServiceInstanceListSupplierInterceptor.java	31.25%	9 Missing and 2 partials :warning:
...eptor/OkHttpClientInterceptorChainInterceptor.java	75.00%	7 Missing and 2 partials :warning:
...declarer/OkHttpClientInterceptorChainDeclarer.java	0.00%	4 Missing :warning:
.../io/sermant/router/common/config/RouterConfig.java	50.00%	3 Missing :warning:
... and 1 more

Flag	Coverage Δ	Complexity Δ
unittests	44.10% <32.82%> (-0.04%)	182.00 <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
.../router/spring/declarer/OkHttp3ClientDeclarer.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...rmant/router/spring/utils/BaseHttpRouterUtils.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...declarer/BaseRegistryPluginAdaptationDeclarer.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../io/sermant/router/common/config/RouterConfig.java	57.14% <50.00%> (-1.00%)	0.00 <0.00> (ø)
...declarer/OkHttpClientInterceptorChainDeclarer.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...eptor/OkHttpClientInterceptorChainInterceptor.java	75.00% <75.00%> (ø)	0.00 <0.00> (?)
...er/spring/interceptor/LoadBalancerInterceptor.java	61.29% <31.25%> (-32.83%)	0.00 <0.00> (ø)
...ceptor/ServiceInstanceListSupplierInterceptor.java	56.41% <31.25%> (-19.59%)	0.00 <0.00> (ø)
...sermant/router/spring/utils/SpringRouterUtils.java	31.81% <20.00%> (-22.73%)	0.00 <0.00> (ø)
...pring/interceptor/BaseLoadBalancerInterceptor.java	62.50% <45.83%> (-13.02%)	0.00 <0.00> (ø)
... and 3 more

... and 3 files with indirect coverage changes