`nw.DType`, `pl.DataType` feature parity

[dangotbanned]

Description

Collecting some issues/threads on things we don't support yet but could

Related

• Short repr (e.g. i64)
  • feat: Use _repr_html_ when native supports it #2776 (comment)
  • feat: Use _repr_html_ when native supports it #2776 (comment)
  • https://github.com/pola-rs/polars/blob/e006aad236c29d258ad4a90b8af6911e8fe5599b/crates/polars-core/src/datatypes/dtype.rs#L1053-L1110
• Supertyping rules for concat(how="..._relaxed")
  • chore: Align nw.concat(..., how="vertical") behavior across backend for schema mismatch #3191 (comment)
  • https://github.com/pola-rs/polars/blob/40e03c19b67dbda3b81becb5321ece3900fec222/crates/polars-core/src/utils/supertype.rs#L141-L504

Likely out-of-scope

• DataTypeExpr
• DataType.{min,max}