Recipe and Input class definitions with e2e export

Differential Revision: [D71946730](https://our.internmc.facebook.com/intern/diff/D71946730/)

[ghstack-poisoned]

Author: tarun292

export/TARGETS

@@ -0,0 +1,36 @@
+load("@fbcode_macros//build_defs:python_library.bzl", "python_library")
+
+oncall("executorch")
+
+python_library(
+    name = "recipe",
+    srcs = [
+        "_recipe.py",
+    ],
+    deps = [
+        "//caffe2:torch",
+        "//executorch/exir/backend:backend_api",
+        "//executorch/exir:pass_manager",
+    ]
+)
+
+python_library(
+    name = "export",
+    srcs = [
+        "_export.py",
+    ],
+    deps = [
+        ":recipe",
+    ]
+)
+
+python_library(
+    name = "lib",
+    srcs = [
+        "__init__.py",
+    ],
+    deps = [
+        ":export",
+        ":recipe",
+    ],
+)

export/__init__.py

@@ -0,0 +1,24 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+"""
+ExecuTorch export module.
+
+This module provides the tools and utilities for exporting PyTorch models
+to the ExecuTorch format, including configuration, quantization, and
+export management.
+"""
+
+# pyre-strict
+
+from ._export import ExportSession, export
+from ._recipe import ExportRecipe
+
+__all__ = [
+    "ExportRecipe",
+    "ExportSession",
+    "export",
+]