POC: Integrate SQL plugin with SDK

[owaiskazi19]

Is your feature request related to a problem? Please describe.

• Interface with SDK
• Dependencies on PluginsService for SQL plugin to run independently

1. pluginsService.updatedSettings()
2. pluginsService.filterPlugins(Plugin.class)
3. pluginsService.getPluginSettingsFilter()
4. p.getNamedXContent().stream() 

• Integrate plugin extensions with SDK

Need to remove the above mentioned to run repository-s3 as an independent process.

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