### Motivation
Fixes#238 and #231.
### Changes
- Extracted the unclean shutdown test from `HTTPClientTests` into their own file `HTTPClientUncleanSSLConnectionShutdownTests`
- Copy and pasted @weissi great explanation from #238 into the test file
- Removed property `ignoreUncleanSSLShutdown` everywhere
### Result
`ignoreUncleanSSLShutdown` on `HTTPClient.Configuration` is deprecated and ignored.
Co-authored-by: Johannes Weiss <johannesweiss@apple.com>
- a new `RequestOptions` struct was created, that can be used to set request specific options. It is required by the `HTTPExecutableRequest`
- Added support for `ignoreUncleanSSLShutdown` in the `HTTPRequestStateMachine` and the `HTTP1ConnectionStateMachine`. In http/2 `ignoreUncleanSSLShutdown` is always off.
### Motivation
NIO may send `channelRead` events without a handlers requesting more data with a `context.read()` invocation. This happens if the remote has closed the connection and NIO wants to inform the handlers as soon as possible.
### Changes
- Don't `precondition` on `channelRead` events anymore.
- Close channel if we received an http end without a `context.read()` invocation
- `ConsumerControlState` was replaced with `ResponseStreamState` in `HTTPRequestStateMachine`
- `channelRead`s are buffered up to a `channelReadComplete`.
- on `channelReadComplete` all buffered body parts are forwarded to the consumer
This commit adds an explicit `HTTPRequestStateMachine`. It is intended to be used in two instances in the future:
1. As a substate machine for a `HTTP1ConnectionStateMachine`, when the connection is in a request.
2. As a state machine for a `HTTP2RequestHandler` that operates on a single http2 stream created by the multiplexer.
The new code paths are not triggered today, but will be enabled in the future.
Fabian Fett