`defmt::Format` implementation for raw pointers diverges from `core::Debug` implementation

[japaric]

defmt

defmt::println!("{:?}", 1 as *const u8);

output:

 1
└─ hello::__cortex_m_rt_main @ src/bin/hello.rs:8

core::fmt

println!("{:?}", 1 as *const u8);

output:

0x1

---

defmt should also include the 0x prefix.

The current format makes it hard to tell that the number is a hexadecimal value. For example,

defmt::trace!(256 as *const u8);

produces:

TRACE 256 as * const u8 = 100

100 looks like one-hundred