Subsystem
ktor-client, ktor-http/common

Is your feature request related to a problem? Please describe.
ktor-client cannot be used for URLs which are not supported by the URL Encoding format.

I failed to replace an HTTP client with ktor-client just because we needed to call a URL like/api?k1=v1;k1=v2 (non-encoded; instead of%3B). As far as I checked, there's no way to bypass URL Encoding in ktor-client.

In other libraries, typically we can set parameters just like a simpleMap<String, List<String>>. I agree that it's better to always use a sanitized request object, but it would be too strict not to have an option to disable encoding.

Describe the solution you'd like
I openeda PR to add an option to bypass the URL Encoding when building a URL.

Motivation to include to ktor
I believe that users of ktor-client shouldn't be blocked by the implementation of a server URL because they might not have control over it.

(Please let me know if there's an option to resolve the above problem.)