refactor: rename method to avoid confusion

- rename SqliteDb::new to `_::open` as it's not return Self
lint message: methods called `new` usually return `Self`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#new_ret_no_self
- rename method `add` to `add_calgorithm`
The semantics of this has nothing to do with an `add` operation in the sense of the `Add` trait.
And method `add` can be confused for the standard trait method std::ops::Add::add
lint https://rust-lang.github.io/rust-clippy/rust-1.93.0/index.html#should_implement_trait

src/api/common/signature/checksum.rs

@@ -122,7 +122,7 @@ impl Checksummer {
 		}
 	}
 
-	pub fn add(mut self, algo: Option<ChecksumAlgorithm>) -> Self {
+	pub fn add_algorithm(mut self, algo: Option<ChecksumAlgorithm>) -> Self {
 		match algo {
 			Some(ChecksumAlgorithm::Crc32) => {
 				self.crc32 = Some(new_crc32());

src/api/common/signature/streaming.rs

@@ -60,7 +60,7 @@ pub fn parse_streaming_body(
 					request_trailer_checksum_algorithm(req.headers())?
 						.ok_or_bad_request("Missing x-amz-trailer header")?,
 				);
-				checksummer = checksummer.add(algo);
+				checksummer = checksummer.add_algorithm(algo);
 				algo
 			} else {
 				None