Refactors and Minor Updates

🩰 What's New

• Added hub.ingest for automatic creation of datasets
• Added hub.list to help users find publicly available datasets
• Lots of refactors to help developers

🧭 What's Changed

• kaggle argument fix (#1101) @thisiseshan
• Polish top directory (#1054) @kristinagrig06
• Ban dataset attributes as tensor names (#1103) @kristinagrig06
• update tensors (#1089) @mccrearyd
• More sample compressions (#1087) @farizrahman4u
• [small] all scalars have shape (1,) instead of () (#1102) @mccrearyd
• refactor input pipeline for samples (#1099) @mccrearyd
• Integrate hub auto + kaggle (#1075) @thisiseshan
• List datasets (#1048) @kristinagrig06

⚙️ Who Contributes

@AbhinavTuli, @farizrahman4u, @kristinagrig06, @mccrearyd and @thisiseshan