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Merge rust-bitcoin/rust-bitcoin#2852: Add inherent functions to hashes

<a class=hub.com/rust-bitcoin/rust-bitcoin/commit/18b2788a5ac8d052624cd23687d9628ecc557615">18b2788a5<a href="https://github.com/rust-bitcoin/rust-bitcoin/commit/72ce271b6b375067424d312742a0a46802ee5f62"> api: Run just check-api (Tobin C. Harding)
<a class="double-link" href="https://github.com/rust-bitcoin/rust-bitcoin/commit/6b7d02e5ae0bb6a3d3ba0fe30da942200a171f70">6b7d02e5a</a> Add inherent functions to hashes (Tobin C. Harding)

Pull request description:

  Currently we have a trait `Hash` that is required for `Hmac`, `Hkdf`, and other use cases. However, it is unegonomic for users who just want to do a simple hash to have to import the trait.

  Add inherent functions to all hash types including those created with the new wrapper type macros.

  This patch introduces some duplicate code but we are trying to make progress in the hashes API re-write. We can come back and de-dublicate later.

  Includes making `to_byte_array`,`from_byte_array`, `as_byte_array`, and `all_zeros` const where easily possible.

ACKs for top commit:
  apoelstra:
    ACK 18b2788a5ac8d052624cd23687d9628ecc557615

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