Refactor: Extract new crate binstalk-manifests (#511)

* Refactor: Extract new crate binstalk-manifests
* Fix clippy warning in mod `binstall_crates_v1`
* Rm unused deps in binstalk
* Update release-pr

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

crates/binstalk-manifests/src/helpers.rs

@@ -0,0 +1,25 @@
+use std::{fs, io, path::Path};
+
+use once_cell::sync::Lazy;
+use url::Url;
+
+/// Returned file is readable and writable.
+pub(crate) fn create_if_not_exist(path: impl AsRef<Path>) -> io::Result<fs::File> {
+    let path = path.as_ref();
+
+    let mut options = fs::File::options();
+    options.read(true).write(true);
+
+    options
+        .clone()
+        .create_new(true)
+        .open(path)
+        .or_else(|_| options.open(path))
+}
+
+pub(crate) fn cratesio_url() -> &'static Url {
+    static CRATESIO: Lazy<Url, fn() -> Url> =
+        Lazy::new(|| Url::parse("https://github.com/rust-lang/crates.io-index").unwrap());
+
+    &CRATESIO
+}