Fix enum case with rawValue includes trailing comment

[art-divin]

Context

When SyntaxTreeCollector visits EnumDeclSyntax, EnumDeclSyntax is being parsed from EnumCase extension (file EnumCase+SwiftSyntax.swift).

In there there's a logic which extracts the rawValue from the EnumDeclSyntax by assigning equal sign to nil:

var value = node.rawValue?.withEqual(nil).description.trimmed

Problem Statement

Using node.rawValue does not eliminate contents of trailing trivia:

po node.rawValue?.withEqual(nil)
...
    ▿ value : IntegerLiteralExprSyntax
      - unexpectedBeforeDigits : nil
      ▿ digits : integerLiteral("0")
        - text : "0"
        ▿ leadingTrivia : []
          - pieces : 0 elements
        ▿ trailingTrivia : [spaces(1), lineComment("// some comment")]
          ▿ pieces : 2 elements
            ▿ 0 : spaces(1)
              - spaces : 1
            ▿ 1 : lineComment("// some comment")
              - lineComment : "// some comment"
        ▿ tokenKind : TokenKind
          - integerLiteral : "0"
...

By adding withTrailingTrivia(.zero). it is possible to eliminate comments before and after defined rawValue.

Notes

Resolves #1154

[rocketnik]

💜Thank you