Add Range and LSPRange initializers for better interoperability (#24)

Added initializers to the Range type for easy creation from Position and
LSPRange. Enhanced LSPRange with an initializer that takes a Range<Position>. This
improves the interoperability between these structures in the language server protocol.

Sources/LanguageServerProtocol/BasicStructures.swift

@@ -33,6 +33,16 @@ extension Position: Comparable {
 	}
 }
 
+extension Range where Bound == Position {
+	public init(_ start: Position, _ end: Position) {
+		self.init(uncheckedBounds: (lower: start, upper: end))
+	}
+
+	public init(_ range: LSPRange) {
+		self.init(uncheckedBounds: (lower: range.start, upper: range.end))
+	}
+}
+
 public struct LSPRange: Codable, Hashable, Sendable {
 	public static let zero = LSPRange(start: .zero, end: .zero)
 
@@ -49,6 +59,11 @@ public struct LSPRange: Codable, Hashable, Sendable {
 		self.end = Position(endPair)
 	}
 
+	public init(_ other: Range<Position>) {
+		self.start = other.lowerBound
+		self.end = other.upperBound
+	}
+
 	public func contains(_ position: Position) -> Bool {
 		return position > start && position < end
 	}