Move solana_client fixture to a global fixture

So multiple test files can use it.

Author: Jeff Schroeder

tests/conftest.py

@@ -0,0 +1,10 @@
+import pytest
+from pythclient.solana import SolanaClient
+
+
+@pytest.fixture
+def solana_client():
+    return SolanaClient(
+        endpoint="https://example.com",
+        ws_endpoint="wss://example.com",
+    )

tests/test_product_account.py

@@ -3,23 +3,14 @@
 
 import pythclient.pythaccounts
 from pythclient.exceptions import NotLoadedException
-from pythclient.solana import SolanaPublicKey, SolanaClient
+from pythclient.solana import SolanaPublicKey
 from pythclient.pythaccounts import (
     _VERSION_2,
-    PythPriceAccount,
     PythProductAccount,
     _read_attribute_string,
 )
 
 
-@pytest.fixture
-def solana_client():
-    return SolanaClient(
-        endpoint="https://example.com",
-        ws_endpoint="wss://example.com",
-    )
-
-
 @pytest.fixture
 def product_account_bytes():
     return bytes(