feat(compiler): Python bindings (#53)

- feat(compiler): python bindings
- build: update docker image for python bindings
- pin pybind11 to 2.6.2, 2.7 is not having correct include_dirs set (still
a question why?)
- using generated parser/printer

compiler/test_python.py

@@ -0,0 +1,25 @@
+import zamalang
+import zamalang.dialects.hlfhe as hlfhe
+import mlir.dialects.builtin as builtin
+import mlir.dialects.std as std
+from mlir.ir import *
+
+
+def main():
+    with Context() as ctx, Location.unknown():
+        # register zamalang's dialects
+        zamalang.register_dialects(ctx)
+
+        module = Module.create()
+        eint16 = hlfhe.EncryptedIntegerType.get(ctx, 16)
+        with InsertionPoint(module.body):
+            func_types = [RankedTensorType.get((10, 10), eint16) for _ in range(2)]
+            @builtin.FuncOp.from_py_func(*func_types)
+            def fhe_circuit(*arg):
+                return arg[0]
+
+        print(module)
+
+
+if __name__ == "__main__":
+    main()