Add additional re-exports

As we do for other types add two new alias' at the crate root of
`primitives`:

- `BlockVersion`

We have a bunch of alias' already e.g., `block::Header as BlockHeader`.

- `TxVersion`

This could equally be `TransactionVersion` to match other alias' but
we also have `TxIn`, `TxOut` so there is an argument for `Tx`. In
light of the fact that there are arguments on both sides opt for the
more terse. Another solution would be adding both?

Also re-export them from the crate root of `bitcoin`.

bitcoin/src/lib.rs

@@ -120,14 +120,15 @@ pub mod taproot;
 pub use primitives::{
     block::{
         Block, BlockHash, Checked as BlockChecked, Header as BlockHeader,
-        Unchecked as BlockUnchecked, Validation as BlockValidation, WitnessCommitment,
+        Unchecked as BlockUnchecked, Validation as BlockValidation, Version as BlockVersion,
+        WitnessCommitment,
     },
     merkle_tree::{TxMerkleNode, WitnessMerkleNode},
     opcodes::Opcode,
     pow::CompactTarget, // No `pow` module outside of `primitives`.
     script::{Script, ScriptBuf},
     sequence::{self, Sequence}, // No `sequence` module outside of `primitives`.
-    transaction::{OutPoint, Transaction, TxIn, TxOut, Txid, Wtxid},
+    transaction::{OutPoint, Transaction, TxIn, TxOut, Txid, Version as TxVersion, Wtxid},
     witness::Witness,
 };
 #[doc(inline)]

primitives/src/lib.rs

@@ -74,14 +74,14 @@ pub use self::{
 };
 #[doc(inline)]
 pub use self::{
-    block::{BlockHash, Header as BlockHeader, WitnessCommitment},
+    block::{BlockHash, Header as BlockHeader, Version as BlockVersion, WitnessCommitment},
     locktime::{absolute, relative},
     merkle_tree::{TxMerkleNode, WitnessMerkleNode},
     opcodes::Opcode,
     pow::CompactTarget,
     sequence::Sequence,
     taproot::{TapBranchTag, TapLeafHash, TapLeafTag, TapNodeHash, TapTweakHash, TapTweakTag},
-    transaction::{OutPoint, Txid, Wtxid},
+    transaction::{OutPoint, Txid, Version as TxVersion, Wtxid},
 };
 
 #[rustfmt::skip]