HADOOP-19609. ABFS: Apache Client Connection Pool Relook

[bhattmanish98]

JIRA: https://issues.apache.org/jira/browse/HADOOP-19609

Description
The ABFS (Azure Blob File System) driver currently utilizes the default JDK HTTP client to communicate with the Azure Storage backend service, known as XFE. While the JDK client is lightweight, simple, and built into the JDK, it falls short when it comes to providing advanced connection management capabilities.
By switching to Apache HTTP Client, the ABFS driver aims to gain better control over HTTP connections while enabling enterprise-level features such as configurable keep-alive strategies, idle connection eviction, retries on failure, and better resource usage tracking.
This is the initial PR where we have optimized the structure of keep alive cache for Apache client. Migration from JDK and Apache client will be done in subsequent PR.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 21s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 2 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	40m 53s		trunk passed
+1 💚	compile	0m 27s		trunk passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	compile	0m 22s		trunk passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	checkstyle	0m 23s		trunk passed
+1 💚	mvnsite	0m 27s		trunk passed
+1 💚	javadoc	0m 29s		trunk passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 23s		trunk passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	0m 47s		trunk passed
+1 💚	shadedclient	21m 42s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 18s		the patch passed
+1 💚	compile	0m 21s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javac	0m 21s		the patch passed
+1 💚	compile	0m 16s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	javac	0m 16s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 13s	/results-checkstyle-hadoop-tools_hadoop-azure.txt	hadoop-tools/hadoop-azure: The patch generated 4 new + 3 unchanged - 0 fixed = 7 total (was 3)
+1 💚	mvnsite	0m 20s		the patch passed
+1 💚	javadoc	0m 16s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 18s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	0m 45s		the patch passed
+1 💚	shadedclient	21m 23s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 20s		hadoop-azure in the patch passed.
+1 💚	asflicense	0m 26s		The patch does not generate ASF License warnings.
		93m 52s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7817/1/artifact/out/Dockerfile
GITHUB PR	#7817
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux b6b106bf7326 5.15.0-143-generic #153-Ubuntu SMP Fri Jun 13 19:10:45 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / b9e21c7
Default Java	Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7817/1/testReport/
Max. process+thread count	556 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-azure U: hadoop-tools/hadoop-azure
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7817/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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