Move optimize into a builtin plugin

src/ocrmypdf/builtin_plugins/optimize.py

@@ -0,0 +1,27 @@
+# © 2022 James R. Barlow: github.com/jbarlow83
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+"""Built-in plugin to implement PDF page optimization."""
+
+from pathlib import Path
+
+from ocrmypdf import PdfContext, hookimpl
+from ocrmypdf._concurrent import Executor
+from ocrmypdf._pipeline import get_pdf_save_settings, should_linearize
+from ocrmypdf.optimize import optimize
+
+
+@hookimpl
+def optimize_pdf(
+    input_pdf: Path, output_pdf: Path, context: PdfContext, executor: Executor
+) -> Path:
+    save_settings = dict(
+        linearize=should_linearize(input_pdf, context),
+        **get_pdf_save_settings(context.options.output_type),
+    )
+    optimize(input_pdf, output_pdf, context, save_settings, executor)
+    return output_pdf