Backport" HBASE-28600 Enable setting blockcache on-heap sizes in bytes (#6422)" to branch-2.6

[jinhyukify]

Tested same result and logs in this comment

I introduced the StorageSize and StorageUnit classes from Hadoop 3.x in 82eeb50
Another approach could have been implementing similar methods in our Size class we are already using to parse storage sizes.
However, since Hadoop 3 already provides a nice way to parse storage sizes, I thought it's also okay to backport these related classes to HBase 2.x and use them directly.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
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			_ Prechecks _
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			_ branch-2.6 Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
+1 💚	asflicense	0m 18s		The patch does not generate ASF License warnings.
		41m 3s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6545/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#6545
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			_ Patch Compile Tests _
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		208m 17s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6545/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#6545
Optional Tests	javac javadoc unit compile shadedjars
uname	Linux 7e366db3e0da 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
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Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6545/1/console
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+0 🆗	reexec	0m 45s		Docker mode activated.
-0 ⚠️	yetus	0m 4s		Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --author-ignore-list --blanks-eol-ignore-file --blanks-tabs-ignore-file --quick-hadoopcheck
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		213m 16s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6545/1/artifact/yetus-jdk17-hadoop3-check/output/Dockerfile
GITHUB PR	#6545
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		225m 51s

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