Serialize directly into writer in CairoPie::write_zip_file (#1736)

* Write directly to writer

* Impl Serialize & Deserialize for CairoPieMemory

* Revert "Impl Serialize & Deserialize for CairoPieMemory"

This reverts commit 3477b1c.

* Fix

* Add changelog entry

CHANGELOG.md

@@ -1,6 +1,9 @@
 ## Cairo-VM Changelog
 
 #### Upcoming Changes
+
+* Serialize directly into writer in `CairoPie::write_zip_file`[#1736](https://github.com/lambdaclass/cairo-vm/pull/1736)
+
 * feat: Add support for cairo1 run with segements arena validation.
   * Refactored the runner CASM code generation to user a more high level builder.
   * Added segment merging of the dictionary segments.

vm/src/vm/runners/cairo_pie.rs

@@ -254,15 +254,15 @@ impl CairoPie {
         let options =
             zip::write::FileOptions::default().compression_method(zip::CompressionMethod::Deflated);
         zip_writer.start_file("version.json", options)?;
-        zip_writer.write_all(serde_json::to_string(&self.version)?.as_bytes())?;
+        serde_json::to_writer(&mut zip_writer, &self.version)?;
         zip_writer.start_file("metadata.json", options)?;
-        zip_writer.write_all(serde_json::to_string(&self.metadata)?.as_bytes())?;
+        serde_json::to_writer(&mut zip_writer, &self.metadata)?;
         zip_writer.start_file("memory.bin", options)?;
         zip_writer.write_all(&self.memory.to_bytes())?;
         zip_writer.start_file("additional_data.json", options)?;
-        zip_writer.write_all(serde_json::to_string(&self.additional_data)?.as_bytes())?;
+        serde_json::to_writer(&mut zip_writer, &self.additional_data)?;
         zip_writer.start_file("execution_resources.json", options)?;
-        zip_writer.write_all(serde_json::to_string(&self.execution_resources)?.as_bytes())?;
+        serde_json::to_writer(&mut zip_writer, &self.execution_resources)?;
         zip_writer.finish()?;
         Ok(())
     }