Merge pull request #253 from proto-graphql/izumin5210/emit-imported-files-option

docs(changeset): support `emit_imported_files` option

Author: izumin5210

.changeset/polite-hairs-tap.md

@@ -0,0 +1,7 @@
+---
+"@proto-graphql/codegen-core": patch
+"@proto-graphql/proto-descriptors": patch
+"@proto-graphql/protoc-plugin-helpers": patch
+---
+
+support `emit_imported_files` option