Fix Parse() then AST.toString() to restore square brackets on column names

[Copilot]

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Problem

alasql.parse() then AST.toString() loses square brackets on column names that require them (spaces, periods, special chars).

const ast = alasql.parse('SELECT [Foo Bar] FROM tbl');
console.log(ast.toString()); // "SELECT Foo Bar FROM tbl" ❌

Fix

Modified Column.toString() in src/50expression.js to handle column IDs stored as {val, wrap} objects by the parser.

• When columnid is an object with val and wrap properties, reconstruct the original bracketed/backticked notation
• Extracted duplicated condition check into a variable for maintainability

Test Coverage

Added test/test1740.js with 6 test cases:

• [Foo Bar] - space in column name
• [Foo.Bar] - period in column name
• FooBar - regular column (no brackets added)
• Multiple bracketed columns in same query
• Special characters in column name
• Backtick syntax (`Foo Bar`)

const ast = alasql.parse('SELECT [Foo Bar] FROM tbl');
console.log(ast.toString()); // "SELECT [Foo Bar] FROM tbl" ✓

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