chore: reduce some operations module functions to crate level visibility

crates/core/src/operations/mod.rs

@@ -286,7 +286,7 @@ pub fn get_num_idx_cols_and_stats_columns(
 /// Get the target_file_size from the table configuration in the sates
 /// If table_config does not exist (only can occur in the first write action) it takes
 /// the configuration that was passed to the writerBuilder.
-pub fn get_target_file_size(
+pub(crate) fn get_target_file_size(
     config: &Option<crate::table::config::TableConfig<'_>>,
     configuration: &HashMap<String, Option<String>>,
 ) -> i64 {