Added IndexMetadataModel to metadata lib along with other required dependencies

[gargmanik13]

Description

• Added IndexMetadataModel to metadata lib along with other required dependencies
• Created ContextModel, SettingsModel and IndexMetadataModel.
• Created MetadataWriteable interface for serialization of dependencies which can't or we don't want to move to metadata lib

Related Issues

Resolves #13197

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for eb45ca7: 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 a932a83: FAILURE

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[github-actions]

❌ Gradle check result for 71188da: FAILURE

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[gargmanik13]

❌ Gradle check result for 71188da: 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?

Test Result (3 failures / +3)
org.opensearch.common.settings.ConsistentSettingsServiceTests.testSingleStringSetting
org.opensearch.common.settings.ConsistentSettingsServiceTests.testSingleAffixSetting
org.opensearch.common.settings.ConsistentSettingsServiceTests.testStringAndAffixSettings

java.lang.RuntimeException: The "PBKDF2WithHmacSHA512" algorithm is required for consistent secure settings' hashes