Revert "Add consensus::deserialize_hex function

As this function won't be included in `rust-bitcoin v0.31.0` release according to  rust-bitcoin/rust-bitcoincore-rpc#308 (comment)

Author: lateminer

bitcoin/src/consensus/mod.rs

@@ -11,11 +11,6 @@ pub mod params;
 #[cfg(feature = "bitcoinconsensus")]
 pub mod validation;
 
-use core::fmt;
-
-use hex::{HexToBytesError, HexToBytesIter};
-use internals::write_err;
-
 pub use self::encode::{
     deserialize, deserialize_partial, serialize, Decodable, Encodable, ReadExt, WriteExt,
 };
@@ -25,51 +20,5 @@ pub use self::validation::{
     verify_script, verify_script_with_flags, verify_transaction, verify_transaction_with_flags,
 };
 
-/// Deserialize any decodable type from a hex string.
-pub fn deserialize_hex<T: Decodable>(hex: &str) -> Result<T, DecodeHexError> {
-    let mut decoder = HexToBytesIter::new(hex)?;
-    let rv = Decodable::consensus_decode_from_finite_reader(&mut decoder)?;
-    Ok(rv)
-}
-
-/// Hex decoding error.
-#[derive(Debug)]
-pub enum DecodeHexError {
-    /// Hex decoding error.
-    Decode(HexToBytesError),
-    /// Consensus deserialization error.
-    Deser(encode::Error),
-}
-
-impl fmt::Display for DecodeHexError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        use DecodeHexError::*;
-
-        match *self {
-            Decode(ref e) => write_err!(f, "hex decoding erorr"; e),
-            Deser(ref e) => write_err!(f, "consensus deserialization error"; e),
-        }
-    }
-}
-
-#[cfg(feature = "std")]
-impl std::error::Error for DecodeHexError {
-    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
-        use DecodeHexError::*;
-
-        match *self {
-            Decode(_) | Deser(_) => None,
-        }
-    }
-}
-
-impl From<HexToBytesError> for DecodeHexError {
-    fn from(e: HexToBytesError) -> Self { Self::Decode(e) }
-}
-
-impl From<encode::Error> for DecodeHexError {
-    fn from(e: encode::Error) -> Self { Self::Deser(e) }
-}
-
 #[cfg(feature = "serde")]
 pub mod serde;