Catch exception which throws on the listener notifying when loading extension success.

[ujjboy]

Modification:

• Catch exception which throws on the listener notifying when loading extension success.
• Add test case.

Result:

Fix #224

[codecov-io]

Codecov Report

Merging #229 into 5.4 will decrease coverage by 0.08%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                5.4     #229      +/-   ##
============================================
- Coverage     71.53%   71.45%   -0.09%     
+ Complexity      961      960       -1     
============================================
  Files           341      341              
  Lines         14234    14238       +4     
  Branches       2290     2289       -1     
============================================
- Hits          10183    10174       -9     
- Misses         2858     2865       +7     
- Partials       1193     1199       +6

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/alipay/sofa/rpc/ext/ExtensionLoader.java	82.14% <100%> (+0.37%)	0 <0> (ø)	⬇️
...pay/sofa/rpc/transport/ClientTransportFactory.java	72.3% <0%> (-6.16%)	0% <0%> (ø)
.../main/java/com/alipay/sofa/rpc/tracer/Tracers.java	42.3% <0%> (-2.57%)	0% <0%> (ø)
.../sofa/rpc/registry/zk/ZookeeperRegistryHelper.java	75.86% <0%> (-1.38%)	0% <0%> (ø)
...com/alipay/sofa/rpc/context/RpcRuntimeContext.java	89.02% <0%> (-1.22%)	0% <0%> (ø)
...ava/com/alipay/sofa/rpc/config/RegistryConfig.java	89.21% <0%> (-0.99%)	0% <0%> (ø)
...alipay/sofa/rpc/registry/zk/ZookeeperRegistry.java	59.37% <0%> (-0.79%)	0% <0%> (ø)
.../alipay/sofa/rpc/registry/local/LocalRegistry.java	65.66% <0%> (-0.61%)	28% <0%> (-1%)

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