refactor: Rename get_engine to get_compression_engine and update references

src/compression_engine.rs

@@ -128,7 +128,7 @@ lazy_static! {
     };
 }
 
-pub fn get_engine(compression_type: CompressionType) -> Result<Box<dyn CompressionEngine>> {
+pub fn get_compression_engine(compression_type: CompressionType) -> Result<Box<dyn CompressionEngine>> {
     match compression_type {
         CompressionType::LZ4 => Ok(Box::new(CompressionEngineLZ4::new())),
         CompressionType::GZip => Ok(Box::new(CompressionEngineGZip::new())),