http-content-digest 0.2.0

`Content-Digest` implementation to Request/Response of `http` crate.
Documentation 
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#[derive(Debug, thiserror::Error)]
pub enum DigestError {
    #[error("Http body error")]
    Body,

    #[error("Mismatched content digest.")]
    Mismatch,

    #[error(transparent)]
    ExtractHeader(#[from] ExtractHeaderError),

    #[error("Algorithm not supported.")]
    AlgorithmNotSupported,
}

#[derive(Debug, thiserror::Error)]
pub enum ExtractHeaderError {
    #[error("No {header_name} header found.")]
    NoExist { header_name: &'static str },

    #[error("Failed to convert header value into str: {0}")]
    FailedToStr(http::header::ToStrError),

    #[error(transparent)]
    InvalidHeaderValue(Box<dyn std::error::Error + Sync + Send + 'static>),
}

#[derive(Debug, thiserror::Error)]
#[error("Invalid Content-Digest header value.")]
pub struct InvalidContentDigest;

impl From<InvalidContentDigest> for ExtractHeaderError {
    fn from(error: InvalidContentDigest) -> Self {
        ExtractHeaderError::InvalidHeaderValue(Box::new(error))
    }
}

impl From<sfv::Error> for ExtractHeaderError {
    fn from(e: sfv::Error) -> Self {
        ExtractHeaderError::InvalidHeaderValue(Box::new(e))
    }
}

impl From<base64::DecodeError> for ExtractHeaderError {
    fn from(value: base64::DecodeError) -> Self {
        Self::InvalidHeaderValue(Box::new(value))
    }
}