Replace usage of `reqwest` with `hyper`

[LucioFranco]

Currently, we pull in reqwest for tests in a couple of places but we already pull in hyper and http. So I think it would make sense to remove this additional dependency to reduce compile times and the number of dependencies we require during tests.

[benedikt-roth]

I'd like to give this a shot. Can you assign it to me please?

[LucioFranco]

@rossgardt hi! It's yours, let me know if you need any help :)

[LucioFranco]

@rossgardt any update on this? :)

[benedikt-roth]

Hi. I had some issues in the beginning, but now it looks like it is finally working. Will give you the next update by the end of the week.

[LucioFranco]

@rossgardt Great! Let me know if you have any questions, I am happy to help. :)

[benedikt-roth]

@LucioFranco sorry, I was sick throughout the week. Made some progress today.
However, I am facing an issue and need your support.

let https_client = hyper::Client::builder()
  .build::<_, hyper::Body>(https_conn);
let client = SyncClientBuilder::new()
  .http_client(https_client)
  ...

SyncClientBuilder::http_client requires a reqwest::client::Client. I saw that there is an elastic implementation for hyper (link.) But it seems to be outdated. Any idea how to use elastic with the hyper

[binarylogic]

@rossgardt any update on this? Anything we can help with? Could you let us know if you don't plan on making this change (which is fine 😄 ), and we can get someone on the team to do this.

[MOZGIII]

I noticed reqwest is being used by the dependencies of our dependencies. This means we probably won't have the improvement in compile-times.

[LucioFranco]

@MOZGIII I believe most of them should be possible to be used without reqwest.