Add to and from XContent to ClusterBlock and ClusterBlocks

[shiv0408]

Description

We need to upload the ClusterBlocks object to remote to enable the cluster state publication flow from remote. To do that we need to parse ClusterBlocks object to and from XContent.

Related Issues

Resolves #13692

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
  - [x] Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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[github-actions]

❌ Gradle check result for 75ce997: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 215a135: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[shiv0408]

Created a new issue for unrealted failing test org.opensearch.common.cache.stats.DefaultCacheStatsHolderTests.testConcurrentRemoval - #13695

[github-actions]

❌ Gradle check result for 141b86b: null

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[shiv0408]

Failing test already identified as flaky
org.opensearch.remotestore.RemoteStoreStatsIT.testDownloadStatsCorrectnessSinglePrimaryMultipleReplicaShards - #10152

[github-actions]

❌ Gradle check result for 141b86b: null

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for ee86138: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for ba27fd1: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 83.92857% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 71.56%. Comparing base (b15cb0c) to head (ba27fd1).
Report is 323 commits behind head on main.

Files	Patch %	Lines
...ava/org/opensearch/cluster/block/ClusterBlock.java	79.62%	6 Missing and 5 partials ⚠️
...va/org/opensearch/cluster/block/ClusterBlocks.java	87.71%	1 Missing and 6 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #13694      +/-   ##
============================================
+ Coverage     71.42%   71.56%   +0.14%     
- Complexity    59978    61136    +1158     
============================================
  Files          4985     5059      +74     
  Lines        282275   287628    +5353     
  Branches      40946    41671     +725     
============================================
+ Hits         201603   205829    +4226     
- Misses        63999    64761     +762     
- Partials      16673    17038     +365     

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