Reconsider value parsing of `std/ini`

Currently the parser parses all values into string, but the existing parsers in the ecosystem often work in a different way.

- `npm:ini`
- parses `true` `false` into booleans
- no handling for numbers
- strips double quotes when they are balanced. (no stripping happens if quotes are not balanced)
- also supports array in the form of `array[] = value`
- python `configparser` std module
- parses all values into string by default
- optionally you can call `getboolean` to covert value into boolean (many things are considered boolean such as true/false, yes/no, on/off, 1/0)
- no quote stripping
- `parse_ini_string` builtin function in php
- handles `TRUE` `FALSE` as booleans
- strips quotes around the value. Errors at unbalanced quotes.

(Further investigations of other parsers are welcome)

There seem no consensus in value handling, it might make sense to follow `npm:ini` when there's differences.