[FEATURE] Tool development for Cat Index Tool

[ylwu-amzn]

Is your feature request related to a problem?

Agent framework (#1161 ) needs tools to extend functionality. This issue propose to add cat index tools to it.
The cat index tool should return main information of index

• health status
• shard info: primary/replica shard count, size
• doc count

What solution would you like?
Build tool in ml-commons to retrieve all index information.
Agent framework (#1161 ) will provide a general tool framework. We can build search monitor/alerts tools with that framework.

1. Build against the Tool interface on the agent_framework_dev branch: https://github.com/opensearch-project/ml-commons/blob/feature/agent_framework_dev/spi/src/main/java/org/opensearch/ml/common/spi/tools/Tool.java

2. Review example tools in the Agent Framework POC commit: 1b85cff where there are 6 tools under ml-algorithms/src/main/java/org/opensearch/ml/engine/tools/. A good example is the CatIndices tool: https://github.com/opensearch-project/ml-commons/blob/feature/agent_framework_dev/ml-algorithms/src/main/java/org/opensearch/ml/engine/tools/CatIndexTool.java which shows how to use the NodeClient (IndicesAdminClient) to fetch Cluster Health statistics.

What alternatives have you considered?
N/A

Do you have any additional context?
#1161

[ohltyler]

Closed via #1582