rust: quote: import crate

This is a subset of the Rust `quote` crate, version 1.0.40 (released
2025-03-12), licensed under "Apache-2.0 OR MIT", from:

    https://github.com/dtolnay/quote/raw/1.0.40/src

The files are copied as-is, with no modifications whatsoever (not even
adding the SPDX identifiers).

For copyright details, please see:

    https://github.com/dtolnay/quote/blob/1.0.40/README.md#license
    https://github.com/dtolnay/quote/blob/1.0.40/LICENSE-APACHE
    https://github.com/dtolnay/quote/blob/1.0.40/LICENSE-MIT

The next patch modifies these files as needed for use within the
kernel. This patch split allows reviewers to double-check the import
and to clearly see the differences introduced.

The following script may be used to verify the contents:

    for path in $(cd rust/quote/ && find . -type f -name '*.rs'); do
        curl --silent --show-error --location \
            https://github.com/dtolnay/quote/raw/1.0.40/src/$path \
            | diff --unified rust/quote/$path - && echo $path: OK
    done

Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Gary Guo <gary@garyguo.net>
Tested-by: Jesung Yang <y.j3ms.n@gmail.com>
Link: https://patch.msgid.link/20251124151837.2184382-12-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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