us_inventory code

[SamarAbdelkawy]

Summary of changes

The full working code for us_inventory module. It implements selection policy based on metadata (burnup - enrichment -discharge date) of each SNF assembly in the database, but it doesn't implement selection based on certain required composition yet.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document.
• 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.
• All new and existing tests passed.

Associated Issues and PRs

• Issue: #

Associated Developers

• Dev: @SamarAbdelkawy

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