emit JMH results as JSON (#10747)

Signed-off-by: bomanaps <mercy.boma35@yahoo.com>
Co-authored-by: Simon Dudley <simon.dudley@consensys.net>

Author: bomanaps

build.gradle

@@ -802,6 +802,7 @@ subprojects {
     jmh {
       jmhVersion = '1.37'
       fork = 3
+      resultFormat = 'JSON'
       var inc = _strListCmdArg('includes', [''])
       includes = inc.size() > 1 ? [".*(${inc.join('|')}).*"] : inc
       excludes = _strListCmdArg('excludes', [])