RFR: 8319522: Consolidate heap dump writer and other utilities

[Yi Yang]

Move heap dump writer to heapdumpcompression.hpp and rename it to heapdumpwriter.hpp so that all heapdump utilities appears in the same file. A further refactor is remove AbstractDumpWriter and use DumpWriter directly.

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Commit messages:
 - 8319522: Consolidate heap dump writer and other utilities

Changes: https://git.openjdk.org/jdk/pull/16520/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16520&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319522
  Stats: 1691 lines in 6 files changed: 848 ins; 842 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16520.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16520/head:pull/16520

PR: https://git.openjdk.org/jdk/pull/16520