[jdk17u-dev] RFR: 8298129: Let checkpoint event sizes grow beyond u4 limit

[Ekaterina Vergizova]

I'd like to backport JDK-8298129 to 17u. 
It fixes corrupted jfr dumps that can be generated for applications with a large stack trace pool or string pool. Such dumps can not be read by jfr tool or JMC.
I also plan to backport small follow-up fix JDK-8298649.

The patch doesn't apply cleanly, minor modifications required:
- jfrCheckpointManager.cpp: types in checkpoint_type() are adapted (u1 -> uint8_t insted of juint -> int32_t in jdk20). The type was modified by JDK-8284161 that is not backported to 17u
- jfrCheckpointManager.cpp: changes in write_thread_checkpoint_content() and VirtualThreadLocalCheckpointWriteOp are skipped as this code is absent in 17u. It was added by JDK-8284161 and its follow-up JDK-8293864 that are not backported to 17u
- ChunkParser.java: the second hunk in readEvent() is skipped as this code is absent in 17u. It was added by JDK-8271232 that is not backported to 17u

Tested with tier1 and jdk/jfr tests.

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Commit messages:
 - Backport ea108f504ccb63fc9651e804e3bbba1c108dcead

Changes: https://git.openjdk.org/jdk17u-dev/pull/1102/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1102&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298129
  Stats: 116 lines in 6 files changed: 80 ins; 12 del; 24 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1102.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1102/head:pull/1102

PR: https://git.openjdk.org/jdk17u-dev/pull/1102