Introduce RawTokenSyntax(kind:, tokenText:, ...) for a convenient way to create a token without any trivia

This allows the parser to consistently use the `RawSyntaxData.ParsedToken` form for parsed tokens,
instead of `RawSyntaxData.MaterializedToken`.

Author: akyrtzi

Sources/SwiftParser/Expressions.swift

@@ -1334,8 +1334,7 @@ extension Parser {
       // Collect ".stringSegment" before `\`.
       let segmentToken = RawTokenSyntax(
         kind: .stringSegment,
-        text: SyntaxText(rebasing: text[stringLiteralSegmentStart..<slashIndex]),
-        leadingTriviaPieces: [], trailingTriviaPieces: [],
+        tokenText: SyntaxText(rebasing: text[stringLiteralSegmentStart..<slashIndex]),
         presence: .present,
         arena: self.arena)
       segments.append(RawSyntax(RawStringSegmentSyntax(content: segmentToken, arena: self.arena)))
@@ -1350,8 +1349,7 @@ extension Parser {
         // `\`
         let slashToken = RawTokenSyntax(
           kind: .backslash,
-          text: SyntaxText(rebasing: text[slashIndex..<text.index(after: slashIndex)]),
-          leadingTriviaPieces: [], trailingTriviaPieces: [],
+          tokenText: SyntaxText(rebasing: text[slashIndex..<text.index(after: slashIndex)]),
           presence: .present,
           arena: self.arena)
 
@@ -1360,8 +1358,7 @@ extension Parser {
         if !delimiter.isEmpty {
           delim = RawTokenSyntax(
             kind: .rawStringDelimiter,
-            text: SyntaxText(rebasing: text[delimiterStart..<contentStart]),
-            leadingTriviaPieces: [], trailingTriviaPieces: [],
+            tokenText: SyntaxText(rebasing: text[delimiterStart..<contentStart]),
             presence: .present,
             arena: self.arena)
         } else {
@@ -1427,8 +1424,7 @@ extension Parser {
            segments.last!.is(RawExpressionSegmentSyntax.self))
     let segmentToken = RawTokenSyntax(
       kind: .stringSegment,
-      text: SyntaxText(rebasing: segment),
-      leadingTriviaPieces: [], trailingTriviaPieces: [],
+      tokenText: SyntaxText(rebasing: segment),
       presence: .present,
       arena: self.arena)
     segments.append(RawSyntax(RawStringSegmentSyntax(content: segmentToken,

Sources/SwiftSyntax/Raw/RawSyntaxNodeProtocol.swift

@@ -133,6 +133,23 @@ public struct RawTokenSyntax: RawSyntaxNodeProtocol {
     self = RawTokenSyntax(raw: raw)
   }
 
+  /// Creates a `RawTokenSyntax` with `tokenText` as the token text without any
+  /// trivia, managed by the same `arena`.
+  public init(
+    kind: RawTokenKind,
+    tokenText: SyntaxText,
+    presence: SourcePresence,
+    arena: __shared SyntaxArena
+  ) {
+    self.init(
+      kind: kind,
+      wholeText: tokenText,
+      textRange: 0 ..< tokenText.count,
+      presence: presence,
+      arena: arena
+    )
+  }
+
   /// Creates a `RawTokenSyntax`. `text` and trivia must be managed by the same
   /// `arena`.
   public init(