[Dubbo-#6306] add priority order in TypeBuilder

[zjseu]

What is the purpose of the change

Add priority order in TypeBuilder in order to give high priority to user defined TypeBuilder in TypeDefinitionBuilder.
related issue: #6306

Brief changelog

Add default method order in TypeBuilder

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[codecov-commenter]

Codecov Report

Merging #6307 into master will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #6307      +/-   ##
============================================
- Coverage     60.87%   60.82%   -0.05%     
  Complexity      493      493              
============================================
  Files           999     1000       +1     
  Lines         39930    39932       +2     
  Branches       5752     5752              
============================================
- Hits          24306    24288      -18     
- Misses        12927    12948      +21     
+ Partials       2697     2696       -1     

Impacted Files	Coverage Δ	Complexity Δ
...bbo/metadata/definition/TypeDefinitionBuilder.java	93.33% <100.00%> (+0.22%)	0.00 <0.00> (ø)
...dubbo/metadata/definition/builder/TypeBuilder.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...rg/apache/dubbo/remoting/utils/PayloadDropper.java	15.38% <0.00%> (-30.77%)	0.00% <0.00%> (ø%)
...bo/config/event/listener/LoggingEventListener.java	37.50% <0.00%> (-25.00%)	0.00% <0.00%> (ø%)
...ava/org/apache/dubbo/config/DubboShutdownHook.java	63.82% <0.00%> (-10.64%)	0.00% <0.00%> (ø%)
...che/dubbo/remoting/transport/mina/MinaChannel.java	39.47% <0.00%> (-10.53%)	15.00% <0.00%> (-1.00%)
...e/dubbo/remoting/transport/netty/NettyChannel.java	55.68% <0.00%> (-4.55%)	20.00% <0.00%> (-1.00%)
.../exchange/support/header/HeaderExchangeServer.java	66.98% <0.00%> (-0.95%)	0.00% <0.00%> (ø%)
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	52.34% <0.00%> (-0.57%)	0.00% <0.00%> (ø%)
... and 5 more

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