a handy get extension mechanism

[funkygao]

#35

[codecov]

Codecov Report

Merging #36 (1d6c5fd) into master (7444d5d) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #36      +/-   ##
============================================
+ Coverage     92.26%   92.28%   +0.02%     
- Complexity      227      228       +1     
============================================
  Files            24       24              
  Lines           724      726       +2     
  Branches         92       92              
============================================
+ Hits            668      670       +2     
  Misses           27       27              
  Partials         29       29              

Impacted Files	Coverage Δ	Complexity Δ
...e/src/main/java/io/github/dddplus/runtime/DDD.java	100.00% <100.00%> (ø)	6.00 <1.00> (+1.00)

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