samples: rust: print: Add sample code for Arc printing

This both demonstrates the usage of different print format in Rust and
serves as a selftest for the `Display` and `Debug` implementation of
`Arc` and its friends.

Signed-off-by: Boqun Feng <[email protected]>
Reviewed-by: Björn Roy Baron <[email protected]>
Reviewed-by: Finn Behrens <[email protected]>
Reviewed-by: Vincenzo Palazzo <[email protected]>
Reviewed-by: Gary Guo <[email protected]>
Reviewed-by: Andreas Hindborg <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Applied suggestions and reworded for fixing title typos. ]
Signed-off-by: Miguel Ojeda <[email protected]>

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