chore: Adding autocloseable to AbstractConfigProvider

[eddyv]

Description

Adds AutoCloseable interface to AbstractConfigProvider

Motivation and Context

Depending on how this library is used, it would be nice to auto cleanup resources when using try-with-resources block

How Has This Been Tested?

N/A.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

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[cla-assistant[bot]]

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[eddyv]

duh - closeable extends autocloseable now. whoops.