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Merge bitcoindevkit/rust-esplora-client#98: Implement retryable calls

<a class=hub.com/bitcoindevkit/rust-esplora-client/commit/<a class="double-link" href="https://git"><a class=hub.com/bitcoindevkit/rust-esplora-client/commit/b96270e2993377f121fccdbf117676830f059049">b96270e29 feat(async,blocking)!: implement retryable calls (valued mammal)

Pull request description:

  Based on #93 the PR implements retryable calls for request failure due to too many requests (429) or service unavailable (503).

  Inspired by #71
  h/t @e1a0a0ea

  ### Notes

  I've added the field `max_retries` to the `Builder`. `max_retries` is also added to each of `AsyncClient`, `BlockingClient`. I added the dependency `async-std` in order to have async `sleep`.

  Instead of implementing a trait on the `Request` type as in #71, the approach is to add a method on the client that sends a get request to a url and returns the response after allowing for retries. I tested on the bdk `wallet_esplora_*` example crates against https://blockstream.info/testnet/api and it seemed to resolve the 429 issue.

ACKs for top commit:
  oleonardolima:
    ACK b96270e2993377f121fccdbf117676830f059049
  notmandatory:
    tACK b96270e2993377f121fccdbf117676830f059049

Tree-SHA512: 781241069ac434ba7147ed27563090a6682

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