dubbo-config package hard coded value replacement for few java class

[khanimteyaz]

Replace existing hard coded values for dubbo-config below classes

• dubbo-common/src/main/java/org/apache/dubbo/common/Constants.java
• dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractConfig.java
• dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractInterfaceConfig.java
• dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractMethodConfig.java
• dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractReferenceConfig.java
• dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ConsumerConfig.java

Along with hard coded value replacement have done small refactoring to use java stream and lambda.

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: xxx
• Operating System version: xxx
• Java version: xxx

Steps to reproduce this issue

1. xxx
2. xxx
3. xxx

Pls. provide [GitHub address] to reproduce this issue.

Expected Result

What do you expected from the above steps？

Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

Just put your stack trace here!

[khanimteyaz]

on it.

[zonghaishang]

merged, close it now.