[ISSUE #3713]Add new plugin: basic-auth

[Romic77]

Make sure that:

• [x] You have read the contribution guidelines.
• [x] You submit test cases (unit or integration tests) that back your changes.
• [x] Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #3774 (635f807) into master (c29f397) will decrease coverage by 0.03%. The diff coverage is 14.28%.

@@             Coverage Diff              @@
##             master    #3774      +/-   ##
============================================
- Coverage     70.23%   70.20%   -0.04%     
  Complexity     7159     7159              
============================================
  Files           965      965              
  Lines         26934    26947      +13     
  Branches       2399     2399              
============================================
+ Hits          18918    18919       +1     
- Misses         6565     6577      +12     
  Partials       1451     1451              

Impacted Files	Coverage Δ
...he/shenyu/admin/controller/PlatformController.java	41.66% <0.00%> (-41.67%)	:arrow_down:
...apache/shenyu/admin/utils/ShenyuResultMessage.java	0.00% <ø> (ø)
...ava/org/apache/shenyu/common/enums/PluginEnum.java	100.00% <100.00%> (ø)

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[damonxue]

@Romic77 Pls resolve conflicts.