Add attributesBuilderSupplier for BrokerMetricsManager

[drpmma]

Which Issue(s) This PR Fixes

Fixes #6900

Brief Description

Add attributesBuilderSupplier for BrokerMetricsManager for the extension.

How Did You Test This Change?

Unit test

[xdkxlk]

LGTM

[codecov-commenter]

Codecov Report

Merging #6901 (1d2771e) into develop (aaa4a4b) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 1d2771e differs from pull request most recent head af9ae23. Consider uploading reports for the commit af9ae23 to get more accurate results

@@              Coverage Diff              @@
##             develop    #6901      +/-   ##
=============================================
+ Coverage      42.64%   42.66%   +0.01%     
- Complexity      9106     9109       +3     
=============================================
  Files           1127     1127              
  Lines          79942    79944       +2     
  Branches       10392    10392              
=============================================
+ Hits           34094    34107      +13     
+ Misses         41572    41563       -9     
+ Partials        4276     4274       -2     

Impacted Files	Coverage Δ
.../rocketmq/broker/metrics/BrokerMetricsManager.java	12.23% <100.00%> (+0.54%)	⬆️

... and 26 files with indirect coverage changes

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[ferrirW]

What are the benefits?

[drpmma]

What are the benefits?

It is merely for the sake of facilitating the expansion of the attributesBuilderSupplier. Furthermore, it has already been present within the codebase.

For instance, consider

rocketmq/broker/src/main/java/org/apache/rocketmq/broker/metrics/PopMetricsManager.java

Lines 58 to 59 in aea5811

	public class PopMetricsManager {
	public static Supplier<AttributesBuilder> attributesBuilderSupplier;

and

rocketmq/store/src/main/java/org/apache/rocketmq/store/metrics/DefaultStoreMetricsManager.java

Lines 54 to 55 in aea5811

	public class DefaultStoreMetricsManager {
	public static Supplier<AttributesBuilder> attributesBuilderSupplier;

Simply perform the identical action for the BrokerMetricsManager.