[Ktor] Methods like `KtorHttpUtilsKt.toUrlOrNull` don't catch `URLDecodeException`

[rfc2822]

When we build a Ktor Url from a String, we catch URLParserException, but not URLDecodeException.

• Find out which exceptions can actually be thrown
• Suggest better documentation on Ktor side
• Catch them (or catch all)

[rfc2822]

1. We should use Ktor's parseUrl().
2. parseUrl had the bug that it didn't catch URLDecodeException, which is fixed in Fix crash when URLDecodeException is thrown from parseUrl ktorio/ktor#5231. (Still not released I guess.)