Add ScriptContextError alias

Add an alias to the `miniscript::context` module to maintain backwards
comparability. Also, as for `ScriptContext` this may reduce potential
naming conflicts downstream because "context" is not that unique.

Note the alias is in `miniscript::context` but in `miniscript` there is
a re-export of `Contetxt` but not one of the error.

src/miniscript/context.rs

@@ -7,6 +7,8 @@ use std::error;
 
 use bitcoin::constants::MAX_BLOCK_WEIGHT;
 use bitcoin::hashes::{hash160, ripemd160, sha256};
+/// `ScriptContextError` alias for backwards compatability and to reduce potential naming conflicts.
+pub use ContextError as ScriptContextError;
 
 use super::decode::ParseableKey;
 use crate::miniscript::limits::{