refactor: Convert some things from static to const and refactor into drop-consts

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

drop-consts/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "drop-consts"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+dirs = "6.0.0"

drop-consts/src/lib.rs

@@ -0,0 +1,23 @@
+use std::{cell::LazyCell, path::PathBuf};
+
+#[cfg(not(debug_assertions))]
+pub const DATA_ROOT_PREFIX: &str = "drop";
+#[cfg(debug_assertions)]
+pub const DATA_ROOT_PREFIX: &str = "drop-debug";
+
+pub const DATA_ROOT_DIR: LazyCell<PathBuf> = LazyCell::new(|| {
+        dirs::data_dir()
+            .expect("Failed to get data dir")
+            .join(DATA_ROOT_PREFIX)
+});
+
+pub const DROP_DATA_PATH: &str = ".dropdata";
+
+// Downloads
+pub const MAX_PACKET_LENGTH: usize = 4096 * 4;
+pub const BUMP_SIZE: usize = 4096 * 16;
+
+pub const RETRY_COUNT: usize = 3;
+
+pub const TARGET_BUCKET_SIZE: usize = 63 * 1000 * 1000;
+pub const MAX_FILES_PER_BUCKET: usize = (1024 / 4) - 1;