REST API /exp CSV escaping incompatible with MS Excel

Describe the bug

If string/symbol columns tabs or new-line characters these are escaped in a manner that is similar to JSON escaping.

Today:

curl -G --data-urlencode "query=select * from table5 limit 5" http://localhost:9000/exp
"a","b","c"
10.0,"a\"\nb\rc\r\nd\"' 3",
20.5," a\t",
,,x

Our current escaping isn't compatible with MS Excel.

What we want:

For point of comparison, we should do whatever the csv module in Python's standard library does as it mirrors Excel closely from a compatibility point of view.

>>> import csv
>>> data = [['double-quote', 'new line', 'tab', 'windows new line'],['"', '\n', '\t', '\r\n']]
>>> import io
>>> output = io.StringIO()
>>> csv.writer(output, dialect='excel').writerows(data)
>>> print(output.getvalue())
double-quote,new line,tab,windows new line
"""","
",      ,"
"

We could also consider avoiding double-quoting strings unless required to avoid bloat.

To reproduce

1. Insert some data with new lines, windows new lines, tabs, etc.
2. Query it from /exp (or just via the web console as CSV).
3. Observe incompatible escaping.

Expected Behavior

Once fixed, the output - saved as a .csv file - should open cleanly in excel, including multi-value strings.

Environment

- **QuestDB version**: 6.2.1
- **OS**: all
- **Browser**: any

Additional context

No response

Start at the REST API /exp CSV export and the web console CSV path described in the reproduction steps. Compare its escaping with Python's csv.writer using the excel dialect, then verify that exported files open cleanly in Excel with quotes, tabs, and newline-containing values preserved.