`tynm` -- functions to return shorter `type_name`s

Hiya, have just published tynm, a crate that provides functions to get shorter type names.

Links:

Examples:

// === std library === //
assert_eq!(
    std::any::type_name::<Option<String>>(),
    "core::option::Option<alloc::string::String>",
);

// === tynm === //
// Simple type name:
assert_eq!(tynm::type_name::<Option<String>>(), "Option<String>",);

// Type name with 1 module segment, starting from the most significant module.
assert_eq!(
    tynm::type_namem::<Option<String>>(1),
    "core::..::Option<alloc::..::String>",
);

// Type name with 1 module segment, starting from the least significant module.
assert_eq!(
    tynm::type_namen::<Option<String>>(1),
    "..::option::Option<..::string::String>",
);

// Type name with 1 module segment from both the most and least significant modules.
#[rustfmt::skip]
mod rust_out { pub mod two { pub mod three { pub struct Struct; } } }
assert_eq!(
    tynm::type_namemn::<rust_out::two::three::Struct>(1, 1),
    "rust_out::..::three::Struct",
);

Motivation:

The std::any::type_name function stabilized in Rust 1.38 returns the fully qualified type name with all module segments. This can be difficult to read in error messages, especially for type-parameterized types.

Often, the simple type name is more readable, and enough to distinguish the type referenced in an error.

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