Add heapBuffer allocation to BufferAllocator #4060

Job	Run time
boringssl_clone	4s
clang_format_check	26s
build (ubuntu-latest)	19m 1s
build (macos-latest)	15m 57s
build (windows-latest)	15m 4s
uberjar	9m 8s
openjdk-test (ubuntu-latest, 11, zulu)	2m 3s
openjdk-test (windows-latest, 8, temurin)	2m 7s
openjdk-test (macos-latest, 11, temurin)	2m 37s
openjdk-test (macos-14, 21, temurin)	2m 30s
openjdk-test (macos-latest, 17, temurin)	2m 45s
openjdk-test (ubuntu-latest, 11, temurin)	2m 1s
openjdk-test (windows-latest, 17, temurin)	1m 59s
openjdk-test (ubuntu-latest, 8, zulu)	1m 56s
openjdk-test (windows-latest, 11, zulu)	2m 12s
openjdk-test (windows-latest, 11, temurin)	2m 26s
openjdk-test (macos-latest, 17, zulu)	2m 26s
openjdk-test (ubuntu-latest, 8, temurin)	1m 56s
openjdk-test (windows-latest, 21, zulu)	2m 15s
openjdk-test (macos-latest, 11, zulu)	2m 42s
openjdk-test (windows-latest, 17, zulu)	2m 10s
openjdk-test (macos-14, 11, temurin)	2m 38s
openjdk-test (macos-latest, 21, temurin)	2m 20s
openjdk-test (macos-latest, 8, zulu)	2m 48s
openjdk-test (ubuntu-latest, 21, temurin)	1m 52s
openjdk-test (ubuntu-latest, 21, zulu)	1m 51s
openjdk-test (macos-latest, 21, zulu)	2m 31s
openjdk-test (ubuntu-latest, 17, zulu)	1m 54s
openjdk-test (macos-14, 11, zulu)	2m 20s
openjdk-test (macos-14, 21, zulu)	2m 37s
openjdk-test (windows-latest, 8, zulu)	2m 24s
openjdk-test (macos-14, 17, zulu)	2m 29s
openjdk-test (windows-latest, 21, temurin)	2m 5s
openjdk-test (ubuntu-latest, 17, temurin)	1m 50s
openjdk-test (macos-14, 8, zulu)	2m 26s
openjdk-test (macos-14, 17, temurin)	2m 6s
	2h 7m 56s

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