Reqwest Showcase

[mnmaita]

Some notes from my end:

• I haven't fine tuned the dependencies. We might want to review that and disable default features, only turn on the ones we need, etc.
• I would run this through someone that has experience with async rust since I just did something that makes the example work but I have no idea if this is an OK implementation (e.g. should the runtime be multithreaded always in this scenario or should it be feature gated? do we even need the tokio runtime for this, can it be made simpler? etc.).

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[mnmaita]

@mrchantey here's the PR as promised! Let me know what do you think and please check my notes. Thanks!

[mrchantey]

thank you thats perfect 🙏 ill make sure to get some input from a bevy async wizard before merging.