feat: Add http wait strategy

[sumihiran]

Adds external http wait strategy as an extension of IWaitForContainerOS. In doing so, http wait strategy can be chained with OS specific ones. I am opening this PR for feedback.

Todo

• Wait for status code
• TLS
• Request headers
• Basic authentication
• Response predicate

Example

var waitRequestBuilder = HttpWaitRequest
    .ForPort(8024)
    .ForPath("/actuator/health")
    .ForStatusCode(200)
    .WithReadTimeout(TimeSpan.FromSeconds(5));

Wait.ForUnixContainer()
  .UntilPortIsAvailable(8024)
  .UntilHttpRequestIsCompleted(waitRequestBuilder.build())

[HofmeisterAn]

Looks pretty good, thanks! Just a few minor comments.

[HofmeisterAn]

Any reason why you choose an extension? I think we can put this into WaitForContainerOS.

[HofmeisterAn]

I think you can use the UriBuilder here. If you create HttpRequestMessage in the HttpWaitRequest you probably don't need it here at all.

[HofmeisterAn]

Maybe you can pass the Hostname to something like HttpRequestMessage Build(string hostname, int mappedPublicPort). Or WithHostname(...). That the builder creates the HttpRequestMessage. Then you probably don't need the nested Builder class too.

[HofmeisterAn]

I think you can use the UriBuilder here and store the values in the builder fields.

[HofmeisterAn]

ISet<HttpStatusCode>?

[HofmeisterAn]

I will close this in favor of #717. I've added you as a co-author. Thanks for your contribution.