Refactor entire codebase and rewrite documentation

Sources/DataLiteCore/Protocols/ArgumentsProtocol.swift

@@ -0,0 +1,24 @@
+import Foundation
+
+/// A protocol representing a collection of SQLite argument values.
+///
+/// Conforming types provide indexed access to a sequence of ``SQLiteValue`` elements. This protocol
+/// extends `Collection` to allow convenient typed subscripting using types conforming to
+/// ``SQLiteRepresentable``.
+public protocol ArgumentsProtocol: Collection where Element == SQLiteValue, Index == Int {
+    /// Returns the element at the specified index, converted to the specified type.
+    ///
+    /// This subscript retrieves the argument value at the given index and attempts to convert it to
+    /// a type conforming to ``SQLiteRepresentable``. If the conversion succeeds, the resulting
+    /// value of type `T` is returned. Otherwise, `nil` is returned.
+    ///
+    /// - Parameter index: The index of the value to retrieve and convert.
+    /// - Returns: A value of type `T` if conversion succeeds, or `nil` if it fails.
+    subscript<T: SQLiteRepresentable>(index: Index) -> T? { get }
+}
+
+public extension ArgumentsProtocol {
+    subscript<T: SQLiteRepresentable>(index: Index) -> T? {
+        T.init(self[index])
+    }
+}