qsv fmt --ascii should not use " as the quote character

[LemmingAvalanche]

Is your feature request related to a problem? Please describe.

qsv fmt --ascii uses the ASCII unit separator (U+001F) as the
record delimiter and the ASCII record separator (U+001E) as the record
terminator. The point is to use metacharacters that don’t appear in
regular ASCII text; these characters are neither part of the printable
character subset, nor the whitespace control codes.

But it still uses " as the quote character. That means that data that
contains quotes will need to be quoted using this printable character.

Example CSV:

"he""ll""o","world"
"goodbye","world"

Formatting that with --ascii (using escape codes for unit/record):

$ cargo run --features="feature_capable" --bin=qsv fmt --ascii test-ascii.txt
"he""ll""o"\x1fworld\x1egoodbye\x1fworld\x1e

So you’ve avoided the \n and , metacharacters. But the regular-text
metacharacter " is still there.

Without " as the quote character you would be able to use any kind of
printable/whitespace Unicode text without having to quote any of the data.

Describe the solution you'd like

Use another non-whitespace control code as the quote character. For
example “Substitute” (U+001A).

Describe alternatives you've considered

You can achieve this by adding --quote=$'\x1A':

cargo run --features="feature_capable" --bin=qsv fmt --ascii --quote=$'\x1A' test-ascii.txt

Additional context

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