Python: Serialize large integers as strings in RPC to avoid Jackson limits (#6829)

Jackson 2.15+ rejects JSON numbers exceeding 1000 digits via
StreamReadConstraints.getMaxNumberLength(). Python integers have
no size limit, so a literal like paramiko's 4096-bit DH prime
(1234 decimal digits) was serialized as a raw JSON number, causing
deserialization to fail on the Java side.

Convert integers exceeding Java's long range to strings before
serialization. The original source representation is preserved in
the literal's valueSource field, so printing is unaffected.

Author: knutwannheden

rewrite-python/rewrite/src/rewrite/rpc/send_queue.py

@@ -316,7 +316,14 @@ def _get_primitive_value(self, obj: Any) -> Any:
             return None
         if isinstance(obj, bool):
             return obj
-        if isinstance(obj, (int, str)):
+        if isinstance(obj, int):
+            # Integers exceeding Java's long range cannot be serialized as
+            # JSON numbers (Jackson's StreamReadConstraints rejects them).
+            # Convert to string — the original source is preserved in valueSource.
+            if obj > 9223372036854775807 or obj < -9223372036854775808:
+                return str(obj)
+            return obj
+        if isinstance(obj, str):
             return obj
         if isinstance(obj, float):
             # Special float values (inf, nan) are not valid JSON