feat: support gateway context, feign eager-load support default value.

[shedfreewu]

PR Type

Describe what this PR does for and how you did.

Adding the issue link (#xxx) if possible.

Note

Checklist

• Add information of this PR to CHANGELOG.md in root of project.
• Add documentation in javadoc or comment below the PR if necessary.

Checklist (Optional)

• Will pull request to branch of 2023.
• Will pull request to branch of 2022.
• Will pull request to branch of 2021.
• Will pull request to branch of 2020.
• Will pull request to branch of hoxton.

[SkyeBeFreeman]

建议也更新一下quickstart-scg

[codecov]

Codecov Report

Attention: Patch coverage is 9.66057% with 346 lines in your changes missing coverage. Please review.

Project coverage is 63.82%. Comparing base (4aeca71) to head (efa5163).

Files with missing lines	Patch %	Lines
...d/plugin/gateway/context/ContextGatewayFilter.java	0.00%	85 Missing ⚠️
...teway/context/ContextGatewayPropertiesManager.java	0.00%	64 Missing ⚠️
...ent/cloud/plugin/gateway/context/GroupContext.java	0.00%	62 Missing ⚠️
...instrument/feign/FeignEagerLoadSmartLifecycle.java	0.00%	25 Missing and 1 partial ⚠️
...ugin/gateway/context/ContextGatewayProperties.java	0.00%	14 Missing ⚠️
...plugin/gateway/GatewayPluginAutoConfiguration.java	0.00%	13 Missing ⚠️
.../gateway/context/ContextRoutePredicateFactory.java	0.00%	12 Missing ⚠️
...n/gateway/context/GatewayConfigChangeListener.java	0.00%	12 Missing ⚠️
...tiveLoadBalancerClientFilterBeanPostProcessor.java	0.00%	9 Missing ⚠️
...n/gateway/context/ContextGatewayFilterFactory.java	0.00%	9 Missing ⚠️
... and 12 more

Additional details and impacted files

@@             Coverage Diff              @@
##               2021    #1496      +/-   ##
============================================
- Coverage     67.11%   63.82%   -3.29%     
  Complexity       22       22              
============================================
  Files           335      341       +6     
  Lines          7893     8110     +217     
  Branches        983     1006      +23     
============================================
- Hits           5297     5176     -121     
- Misses         2125     2464     +339     
+ Partials        471      470       -1     

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