HDFS-16451. RBF: Add search box for Router's tab-mounttable web page

[Neilxzn]

Description of PR

https://issues.apache.org/jira/browse/HDFS-16451
In our cluster, we have mount many paths in HDFS Router and it may lead to take some time to load the mount-table page of Router when we open it in the browser.

In order to use the mount-table page more conveniently, maybe we should add a search box style, just like the screenshot below

How was this patch tested?

no new test

For code changes:

none

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 56s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	jshint	0m 0s		jshint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	43m 51s		trunk passed
+1 💚	shadedclient	67m 45s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 36s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	shadedclient	22m 41s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 31s		The patch does not generate ASF License warnings.
		93m 52s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3968/1/artifact/out/Dockerfile
GITHUB PR	#3968
Optional Tests	dupname asflicense shadedclient codespell jshint
uname	Linux e52eea6c1349 4.15.0-162-generic #170-Ubuntu SMP Mon Oct 18 11:38:05 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 5bcf133
Max. process+thread count	601 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-rbf U: hadoop-hdfs-project/hadoop-hdfs-rbf
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3968/1/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org

This message was automatically generated.

[ayushtkn]

Commit message misses jira id:
390967f