[Dubbo-2678] Add ability to turn off SPI auto injection, special support for Object type.

[chickenlj]

What is the purpose of the change

Fix problem reported in apache/skywalking#1769

Brief changelog

• Add Inject annotation
• Printing log instead of throwing Exception in SpringExtensionFactory

Verifying this change

ExtensionLoaderTest.testInjectExtension

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• Make sure there is a GITHUB_issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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[codecov-io]

Codecov Report

Merging #2681 into 2.6.x will increase coverage by 0.04%.
The diff coverage is 57.14%.

@@             Coverage Diff              @@
##              2.6.x    #2681      +/-   ##
============================================
+ Coverage     47.38%   47.42%   +0.04%     
+ Complexity     4297     4292       -5     
============================================
  Files           557      553       -4     
  Lines         24384    24364      -20     
  Branches       4313     4308       -5     
============================================
+ Hits          11554    11555       +1     
+ Misses        11044    11028      -16     
+ Partials       1786     1781       -5

Impacted Files	Coverage Δ	Complexity Δ
...libaba/dubbo/common/extension/ExtensionLoader.java	72.59% <100%> (+0.11%)	117 <0> (+1)	⬆️
...onfig/spring/extension/SpringExtensionFactory.java	68.96% <40%> (-15.65%)	8 <0> (ø)
...baba/dubbo/config/spring/util/AnnotationUtils.java	42.1% <0%> (-19.01%)	4% <0%> (-5%)
...om/alibaba/dubbo/rpc/filter/ActiveLimitFilter.java	83.33% <0%> (-5.56%)	6% <0%> (-1%)
...va/com/alibaba/dubbo/common/utils/ConfigUtils.java	71.42% <0%> (-0.3%)	45% <0%> (+1%)
...com/alibaba/dubbo/config/spring/ReferenceBean.java	22.22% <0%> (ø)	6% <0%> (ø)	⬇️
...ntext/annotation/DubboConfigBindingsRegistrar.java	100% <0%> (ø)	4% <0%> (ø)	⬇️
.../config/spring/status/DataSourceStatusChecker.java	76.47% <0%> (ø)	6% <0%> (ø)	⬇️
...nnotation/DubboConfigBindingBeanPostProcessor.java	67.5% <0%> (ø)	7% <0%> (ø)	⬇️
...ans/factory/annotation/ServiceBeanNameBuilder.java	100% <0%> (ø)	12% <0%> (ø)	⬇️
... and 22 more

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[wu-sheng]

Great. Just send out a warn should be OK.

[xiaqi1210]

What is the purpose of the change

Fix problem reported in apache/skywalking#1769

Brief changelog

• Add Inject annotation
• Printing log instead of throwing Exception in SpringExtensionFactory

Verifying this change

ExtensionLoaderTest.testInjectExtension

Follow this checklist to help us incorporate your contribution quickly and easily:

• Make sure there is a GITHUB_issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Format the pull request title like [Dubbo-XXX] Fix UnknownException when host config not exist #XXX. Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
• Run mvn clean install -DskipTests & mvn clean test-compile failsafe:integration-test to make sure unit-test and integration-test pass.
• If this contribution is large, please follow the Software Donation Guide.

I encountered the same problem when using Skywalking.
I saw that the getExtension method call is inside a try...catch, so even if it throws an exception, it should not affect either, it's just that the injection of this setXxx method failed, which means it will just print an error log, it should not affect other things, right? But in actual testing I found it does affect the construction of ReferenceBean. When getting the reference bean, it gets null, which makes me confused.