RFR: 7366: Object contributions

[Joshua Matsuoka]

This PR addresses JMC-7366, adding Object Contributions for method types in JMC. This allows users to right click on a method in the UI and create an agent plugin probe template for that method, simplifying the user experience a bit.

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Commit messages:
 - Cleanup
 - Removing old comment
 - 7366: Object Contribution to Methods

Changes: https://git.openjdk.java.net/jmc/pull/288/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=288&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7366
  Stats: 308 lines in 6 files changed: 308 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/288.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/288/head:pull/288

PR: https://git.openjdk.java.net/jmc/pull/288