get_interchain: per_chain + chains options (default first anchor per chain); bump 0.5.0

transaction.get_interchain / block.get_interchain take per_chain= and chains=
kwargs mapping to prime-node's ?perChain=&chains= params. Default (no kwargs)
returns one anchor per chain. Shared interchain_query() helper, exported; pytest.

prime_sdk/transaction.py

@@ -1,6 +1,9 @@
 """Transaction endpoints."""
 
+from typing import List, Optional
+
 from .client import CONTENT_TYPE_JSON, Client
+from .interchain import interchain_query
 from .models import (
     InterchainTrace,
     ListTransactionsResponse,
@@ -40,13 +43,25 @@ class TransactionClient:
     def get(self, transaction_id: str) -> Transaction:
         return self._client.get(f"/api/v1/transaction/{transaction_id}", Transaction)
 
-    def get_interchain(self, transaction_id: str) -> InterchainTrace:
+    def get_interchain(
+        self,
+        transaction_id: str,
+        per_chain: Optional[int] = None,
+        chains: Optional[List[str]] = None,
+    ) -> InterchainTrace:
         """Trace a transaction to the validator (verification) blocks that
         validated its prime block and the public-chain interchain anchors those
         validator blocks were bundled into. If the transaction is still pending
-        (not yet in a block) the trace's lists are empty."""
+        (not yet in a block) the trace's lists are empty.
+
+        By default returns the first anchor per public chain (anchor proofs are
+        chained, so the earliest per chain is the meaningful one). ``per_chain``
+        caps anchors per chain (1 = first per chain; 0 = all); ``chains``
+        restricts to specific chain ids."""
         return self._client.get(
-            f"/api/v1/transaction/{transaction_id}/interchain", InterchainTrace
+            f"/api/v1/transaction/{transaction_id}/interchain"
+            f"{interchain_query(per_chain, chains)}",
+            InterchainTrace,
         )
 
     def list(self) -> ListTransactionsResponse: