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kotlinlang

Hi there. Trying to build url with path containing special symbols:
```
URLBuilder(host = "localhost").apply {
    path("%?")
    parameters["?"] = "?"
}
    .buildString()
    .also(::println)
```
The above code produces `<http://localhost/%25??%3F=%3F>` url. The question mark in the path is not encoded. I whould expect the following: `<http://localhost/%25%3F?%3F=%3F>`. If I encode it explicitly `path("%?".encodeURLPath())` the percent sign is encoded twice.

`URLBuilder` uses `encodeURLQueryComponent` to encode a path: <https://github.com/ktorio/ktor/blob/1.2.3/ktor-http/common/src/io/ktor/http/URLBuilder.kt#L50>
Possibly it should use `encodeURLPath`?