Tracking caller on `DataError` construction

[robertbastian]

It would be very useful to store a core::panic::Location inside the DataError. Currently panicking is much more ergonomic than using DataError, because with DataError you only get the location where the error is unwrapped and have to chase down the error message, which often is not a pure literal.

This is currently blocked on rust-lang/rust#76156, as our error constructors are const and core::panic::Location::caller() is not yet.

[sffc]

Losing the caller location when bubbling up errors is I think a known issue with the Rust error propagation model, not specific to DataError. CC @yaahc, thoughts on the recommended pattern here for library code?