[ISSUE #5037]add ut for package com.alibaba.nacos.client.config.utils

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What is the purpose of the change

fix [ISSUE #5037]add ut for package com.alibaba.nacos.client.config.utils
line coverage 82%

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[KomachiSion]

Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:3.1.1:check (validate) on project nacos-client: Failed during checkstyle execution: There are 2 errors reported by Checkstyle 8.29 with style/NacosCheckStyle.xml ruleset.

Please check it