Add backends to __init__.py (#544)

Author: twizmwazin

claripy/__init__.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from claripy import algorithm, ast
+from claripy import algorithm, ast, backends
 from claripy.algorithm import burrow_ite, excavate_ite, is_false, is_true, simplify
 from claripy.annotation import Annotation, RegionAnnotation, SimplificationAvoidanceAnnotation
 from claripy.ast.bool import (
@@ -212,4 +212,5 @@
     "SolverVSA",
     "burrow_ite",
     "excavate_ite",
+    "backends",
 )