fix(csv-stringify): quote fields prefixed by escape_formulas

[abhu85]

With escape_formulas: true, the ' prefix is added after the checks that decide whether a field has to be quoted (containsQuote, containsdelimiter, containsEscape, containsRecordDelimiter). When any of quote, escape, delimiter or record_delimiter is set to ', the added character is neither escaped nor does it trigger quoting, and csv-parse can no longer read the output back with the same options:

stringify([["=1", "x"]], { escape_formulas: true, quote: "'" })
// '=1,x         -> parse(..., { quote: "'" }) throws "Quote Not Closed"
stringify([["=a", 1], ["b", 2]], { escape_formulas: true, record_delimiter: "'", eof: false })
// '=a,1'b,2     -> parse(..., { record_delimiter: "'" }) throws "Invalid Record Length"

This PR moves those four checks after the escape_formulas block, so they see the prefixed value:

stringify([["=1", "x"]], { escape_formulas: true, quote: "'" })
// '"'=1',x      -> [["'=1", "x"]]

quoted_match is still tested against the original value, since it expresses which user values should be quoted (e.g. quoted_match: /^=/ keeps matching formula-like input). Output with the default options is unchanged.

Tests: added one case each for quote, escape, delimiter and record_delimiter set to ' in test/option.escape_formulas.ts. All four fail without the change. npm test in packages/csv-stringify: 236 passing; the only tsc error, in test/option.cast.ts, is already on master since #511.