[#9350] Replace Base64 with java.util.Base64

[emeroad]

No description provided.

[codecov]

Codecov Report

Merging #9351 (4b8fc7c) into master (5d8cf38) will increase coverage by 0.08%.
The diff coverage is 77.77%.

@@             Coverage Diff              @@
##             master    #9351      +/-   ##
============================================
+ Coverage     39.43%   39.52%   +0.08%     
- Complexity    11769    11782      +13     
============================================
  Files          3400     3399       -1     
  Lines         91122    91105      -17     
  Branches      10118    10113       -5     
============================================
+ Hits          35936    36007      +71     
+ Misses        52085    51975     -110     
- Partials       3101     3123      +22     

Impacted Files	Coverage Δ
.../navercorp/pinpoint/plugin/mongo/WriteContext.java	12.43% <75.00%> (+12.43%)	⬆️
...avercorp/pinpoint/web/filter/FilterDescriptor.java	83.58% <100.00%> (+0.24%)	⬆️
...pinpoint/rpc/ChannelWriteFailListenableFuture.java	42.85% <0.00%> (-28.58%)	⬇️
...java/com/navercorp/pinpoint/rpc/DefaultFuture.java	74.31% <0.00%> (-1.84%)	⬇️
...om/navercorp/pinpoint/rpc/codec/PacketDecoder.java	51.66% <0.00%> (-1.67%)	⬇️
...pinpoint/profiler/monitor/DeadlockMonitorTask.java	20.45% <0.00%> (-1.14%)	⬇️
...n/server/bo/serializer/trace/v2/SpanEncoderV0.java	82.88% <0.00%> (-0.54%)	⬇️
...n/server/bo/serializer/trace/v2/SpanDecoderV0.java	81.27% <0.00%> (-0.46%)	⬇️
...com/navercorp/pinpoint/common/util/JvmVersion.java	90.74% <0.00%> (+0.54%)	⬆️
...orp/pinpoint/rpc/server/DefaultPinpointServer.java	81.06% <0.00%> (+1.23%)	⬆️
... and 6 more

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