Fix issue #1740: Preserve square brackets and backticks in column names during AST.toString()

[Copilot]

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Problem

alasql.parse() followed by AST.toString() was losing square brackets on column names with special characters:

var ast = alasql.parse('SELECT [Foo Bar] FROM tbl');
ast.toString(); // Returns "SELECT Foo Bar FROM tbl" - brackets lost

Changes

• Modified Column.toString() in src/50expression.js to detect bracketed column IDs (object with val and wrap properties) and reconstruct proper bracket/backtick syntax
• Added test/test1740.js with 6 test cases covering spaces, periods, special characters, multiple columns, and backticks

Note

The failing test046 (15 == 0) is a pre-existing issue on the develop branch, unrelated to these changes. It tests array bracket notation ([0], [1]) for array-of-arrays queries, which is a separate bug from the column name bracket notation ([Foo Bar]) addressed here.

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