Add a user-friendly panic hook

[messense]

Replacement for human-panic that we removed in the past.

Adopted from Deno: https://github.com/denoland/deno/blob/266915d5ce354fde12b20f8f5ceb5ffdfacb7983/cli/main.rs#L181-L203

Example:

$ cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.21s
     Running `target/debug/maturin`

====================================================================
maturin has panicked. This is a bug in maturin. Please report this
at https://github.com/PyO3/maturin/issues/new/choose.
If you can reliably reproduce this panic, include the
reproduction steps and re-run with the RUST_BACKTRACE=1 environment
variable set and include the backtrace in your report.

Platform: macos aarch64
Version: 0.14.10
Args: target/debug/maturin

thread 'main' panicked at 'Test', src/main.rs:452:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

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