[ISSUE #4321] Add Examples And Configs For C SDK

[zhurq]

Fixes #4321.

Motivation

Add Examples And Configs.

Modifications

Describe the modifications you've done.

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[codecov]

Codecov Report

Merging #4326 (10bfcc4) into master (fef56a5) will decrease coverage by 0.26%.
Report is 137 commits behind head on master.
The diff coverage is 13.38%.

❗ Current head 10bfcc4 differs from pull request most recent head 7dfbbdd. Consider uploading reports for the commit 7dfbbdd to get more accurate results

@@             Coverage Diff              @@
##             master    #4326      +/-   ##
============================================
- Coverage     16.35%   16.09%   -0.26%     
- Complexity     1362     1550     +188     
============================================
  Files           594      730     +136     
  Lines         25393    28640    +3247     
  Branches       2393     2523     +130     
============================================
+ Hits           4152     4611     +459     
- Misses        20818    23581    +2763     
- Partials        423      448      +25     

Files	Coverage Δ
...in/java/org/apache/eventmesh/common/Constants.java	75.00% <ø> (ø)
...org/apache/eventmesh/common/ThreadPoolFactory.java	16.66% <ø> (ø)
.../eventmesh/common/config/convert/ConverterMap.java	71.73% <ø> (ø)
...common/config/convert/converter/ListConverter.java	54.16% <ø> (ø)
...mmon/config/convert/converter/ObjectConverter.java	59.77% <ø> (ø)
...entmesh/common/enums/EventMeshDataContentType.java	0.00% <ø> (ø)
...eventmesh/common/exception/EventMeshException.java	0.00% <ø> (ø)
...apache/eventmesh/common/file/WatchFileManager.java	67.64% <100.00%> (+9.31%)	⬆️
.../eventmesh/common/loadbalance/LoadBalanceType.java	80.00% <ø> (ø)
.../common/loadbalance/RandomLoadBalanceSelector.java	66.66% <ø> (ø)
... and 149 more

... and 400 files with indirect coverage changes

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[Alonexc]

need add license.

[lrhkobe]

LGTM