[dubbo-6756]ssl support load from classpath

[owen200008]

What is the purpose of the change

ssl support load from classpath

Brief changelog

add getURL function like spring

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[codecov-commenter]

Codecov Report

Merging #6756 into master will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #6756      +/-   ##
============================================
- Coverage     58.83%   58.76%   -0.08%     
+ Complexity      507      506       -1     
============================================
  Files          1026     1026              
  Lines         41383    41397      +14     
  Branches       6028     6031       +3     
============================================
- Hits          24348    24327      -21     
- Misses        14274    14305      +31     
- Partials       2761     2765       +4     

Impacted Files	Coverage Δ	Complexity Δ
...apache/dubbo/common/constants/CommonConstants.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...in/java/org/apache/dubbo/common/utils/IOUtils.java	65.45% <0.00%> (-22.36%)	0.00 <0.00> (ø)
...c/main/java/org/apache/dubbo/config/SslConfig.java	19.29% <0.00%> (ø)	0.00 <0.00> (ø)
...rg/apache/dubbo/remoting/utils/PayloadDropper.java	15.38% <0.00%> (-30.77%)	0.00% <0.00%> (ø%)
...mmon/threadpool/support/AbortPolicyWithReport.java	85.00% <0.00%> (-5.00%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/transport/netty/NettyChannel.java	52.27% <0.00%> (-3.41%)	19.00% <0.00%> (-1.00%)
...pache/dubbo/registry/support/AbstractRegistry.java	77.69% <0.00%> (-2.98%)	0.00% <0.00%> (ø%)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	60.00% <0.00%> (-0.59%)	31.00% <0.00%> (ø%)
...figcenter/file/FileSystemDynamicConfiguration.java	62.38% <0.00%> (-0.48%)	0.00% <0.00%> (ø%)
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	63.10% <0.00%> (-0.35%)	0.00% <0.00%> (ø%)
... and 1 more

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[AlbumenJ]

LGTM.