adding graduation_rates_ipeds data

[balit-raibot]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request significantly expands the educational statistics available by adding a new dataset of graduation rates from the Integrated Postsecondary Education Data System (IPEDS). It provides detailed metrics on student completion across various educational attainment levels and institutional types, measured at different completion timeframes. This integration enhances the depth and breadth of educational data, offering valuable insights into student outcomes over a period of more than a decade.

Highlights

• New Dataset Integration: Introduced comprehensive graduation rate data from the Integrated Postsecondary Education Data System (IPEDS).
• Detailed Educational Metrics: The data includes graduation rates for Bachelor's, Associate/Certificate, and Post-Secondary Certificate programs, broken down by public, private non-profit, and private for-profit institutions.
• Extensive Time Series: Provides graduation rates measured at 100%, 150%, and 200% of normal program completion time, spanning cohort years from 2000-2004 (reported as 2009 data) up to 2015-2019 (reported as 2024 data).
• Data Commons Structure: Implemented new metadata, statistical variable definitions, schema, and property-value mappings to properly integrate the IPEDS data into the Data Commons framework.

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[gemini-code-assist]

Code Review

This pull request adds a new dataset for IPEDS Graduation Rates. The changes include the raw input CSV files, the processed output CSV, and the necessary MCF/TMCF files for import. The data and configuration files seem correct and well-structured to handle the inconsistencies in the source data. I've only found a minor issue regarding missing newlines at the end of several files, which is a good practice to add for POSIX compatibility.