Split crates and clean up structure of codebase (#294)

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

crates/lib/tests/parse-meta.rs

@@ -0,0 +1,31 @@
+use binstall::ops::resolve::load_manifest_path;
+use cargo_toml::Product;
+
+#[test]
+fn parse_meta() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let mut manifest_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+    manifest_dir.push_str("/tests/parse-meta.Cargo.toml");
+
+    let manifest = load_manifest_path(&manifest_dir).expect("Error parsing metadata");
+    let package = manifest.package.unwrap();
+    let meta = package.metadata.and_then(|m| m.binstall).unwrap();
+
+    assert_eq!(&package.name, "cargo-binstall-test");
+
+    assert_eq!(
+        &meta.pkg_url,
+        "{ repo }/releases/download/v{ version }/{ name }-{ target }.{ archive-format }"
+    );
+
+    assert_eq!(
+        manifest.bin.as_slice(),
+        &[Product {
+            name: Some("cargo-binstall".to_string()),
+            path: Some("src/main.rs".to_string()),
+            edition: Some(cargo_toml::Edition::E2021),
+            ..Default::default()
+        },],
+    );
+}