RFR: JMC-7798: Make the frame type extensible

[Jaroslav Bachorik]

This change allows the JMC parser users to consume frames with the type set to non-standard values (eg. from async-profiler).

The hard-wired enum approach is replaced with a hybrid solution keeping the standard types in enum-like structure and using a cache for the non-standard types. This allows being fairly flexible when dealing with new frame types while keeping full backward compatibility.

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Commit messages:
 - JMC-7798: Make the frame type extensible

Changes: https://git.openjdk.java.net/jmc/pull/401/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=401&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7798
  Stats: 152 lines in 4 files changed: 113 ins; 23 del; 16 mod
  Patch: https://git.openjdk.java.net/jmc/pull/401.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/401/head:pull/401

PR: https://git.openjdk.java.net/jmc/pull/401