RFR: 6908: Rule for warning about the starting of processes

[Jean-Philippe Bempel]

When a new process was started from the current JVM, we inform with a 50 score
that 1 or more processes was started
based on new JDK15 ProcessStart event

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Commit messages:
 - Rule for warning about the starting of processes

Changes: https://git.openjdk.java.net/jmc/pull/121/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=121&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6908
  Stats: 199 lines in 6 files changed: 199 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/121.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/121/head:pull/121

PR: https://git.openjdk.java.net/jmc/pull/121