Add ability to skip certain interactions from getting saved to disk

[sergiught]

Describe the problem you'd like to have solved

I'd like to have a way to specify which kind of Interaction to skip from being recorded on disk inside a cassette. This would be useful for example if I don't want the cassette spammed with 429s.

Describe the ideal solution

Perhaps something like:

recorder.AddHook(
	func(i *cassette.Interaction) error {
		if i.Response.Code == http.StatusTooManyRequests {
			i.Skip()
			return nil
		}
		return nil
	},
	recorder.BeforeSaveHook,
)

Alternatives and current workarounds

Current workaround would be to manually remove them from the cassette file.

Additional context

• Perhaps it helps to see how we're using this pkg -> https://github.com/auth0/terraform-provider-auth0/blob/main/internal/recorder/http_recorder.go

Thanks a lot for maintaining this! It's a great project. 👍🏻

[dnaeon]

@sergiught , please check #81 and let me know what do you think?

Example hook you could set looks like this.

	hook := func(i *cassette.Interaction) error {
		if i.Request.Method == http.MethodPost && i.Request.Body == "foo" {
			i.DiscardOnSave = true
		}

		return nil
	}