Enable update calcite setting through _plugins/_query/settings API

[penghuo]

Description

1. Enable update calcite setting through _plugins/_query/settings API
2. Add follow up task to enable DocTest on setting. [FEATURE] Enable doctest on Lookup/Join/Subquery #3533

Tests

• calcite default disabled

### Query
POST {{baseUrl}}/_plugins/_ppl/_explain
Content-Type: application/x-ndjson

{
    "query": "source=test00001"
}

### Response
{
  "root": {
    "name": "ProjectOperator",
    "description": {
      "fields": "[]"
    },
    "children": [
      {
        "name": "OpenSearchIndexScan",
        "description": {
          "request": "OpenSearchQueryRequest(indexName=test00001, sourceBuilder={\"from\":0,\"size\":10000,\"timeout\":\"1m\",\"_source\":{\"includes\":[],\"excludes\":[]}}, needClean=true, searchDone=false, pitId=null, cursorKeepAlive=null, searchAfter=null, searchResponse=null)"
        },
        "children": []
      }
    ]
  }
}

• enable calcite

### enable calcite
PUT {{baseUrl}}/_plugins/_query/settings
Content-Type: application/x-ndjson

{
  "transient" : {
    "plugins.calcite.enabled" : true
  }
}

### explain
POST {{baseUrl}}/_plugins/_ppl/_explain
Content-Type: application/x-ndjson

{
    "query": "source=test00001"
}

{
  "calcite": {
    "logical": "CalciteLogicalIndexScan(table=[[OpenSearch, test00001]])\n",
    "physical": "CalciteEnumerableIndexScan(table=[[OpenSearch, test00001]])\n"
  }
}

Related Issues

#3530

Check List

• New functionality includes testing.
• New functionality has been documented.
• New functionality has javadoc added.
• New functionality has a user manual doc added.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[noCharger]

Non-blocking: add IT similar as https://github.com/opensearch-project/sql/blob/main/integ-test/src/test/java/org/opensearch/sql/legacy/PluginIT.java#L34

[dai-chen]

Thanks for the fix!

[penghuo]

Non-blocking: add IT similiar as https://github.com/opensearch-project/sql/blob/main/integ-test/src/test/java/org/opensearch/sql/legacy/PluginIT.java#L34

Agree, track in #3533. It should covered by docTest also.