Add jmx default

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #465 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #465   +/-   ##
=======================================
  Coverage   83.09%   83.09%           
=======================================
  Files         181      181           
  Lines        7240     7240           
  Branches      687      687           
=======================================
  Hits         6016     6016           
  Misses       1224     1224

Impacted Files	Coverage Δ
...x/src/main/scala/wvlet/airframe/jmx/JMXAgent.scala	73.33% <ø> (ø)	⬆️

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