feat(downloads): Separated chunk updates into individual counters

Also added a From<bool> for DownloadThreadControlFlag because I accidentally was calling the wrong one before and had meant to add it anyway

Signed-off-by: quexeky <git@quexeky.dev>

src-tauri/src/downloads/mod.rs

@@ -3,3 +3,4 @@ pub mod download_commands;
 mod download_logic;
 mod download_thread_control_flag;
 mod manifest;
+mod progress_object;