Co-authored-by: Daniela Brozzoni <danielabrozzoni@protonmail.com>

We prepare the BDK repo for a major restructuring.

- database modules removed
- blockchain module removed
- minimal API changes.
- Many macros removed.
- no longer applicable examples removed.
- Much conditional compilation removed. Can compile with --all-features.
- delete verify module

To stop my rust-anlayzer from killing me

To allow you to re-use change addresses from transactions that get cancelled.

instead of bdk's one

we shouldn't have a feature flag for this it should always be done.

If you want to have tests on the hardware-signer you need to install
the python libraries and start the emulator

Also flesh out README a bit

Original repository: https://github.com/LLFourn/bdk_core_staging/tree/250b4f1dcce10805adfb2f201901675eb6076554/bdk_chain

Co-authored-by: Steve Myers <steve@notmandatory.org>
Co-authored-by: 志宇 <hello@evanlinjin.me>
Co-authored-by: LLFourn <lloyd.fourn@gmail.com>
Co-authored-by: rajarshimaitra <rajarshi149@gmail.com>
Co-authored-by: LagginTimes <wzc110@gmail.com>
Co-authored-by: Steve Myers <steve@notmandatory.org>
Co-authored-by: Vladimir Fomene <vladimirfomene@gmail.com>

Original repository: https://github.com/LLFourn/bdk_core_staging/tree/250b4f1dcce10805adfb2f201901675eb6076554/bdk_file_store

Co-authored-by: 志宇 <hello@evanlinjin.me>
Co-authored-by: LLFourn <lloyd.fourn@gmail.com>
Co-authored-by: Vladimir Fomene <vladimirfomene@gmail.com>

Original repository: https://github.com/LLFourn/bdk_core_staging/tree/250b4f1dcce10805adfb2f201901675eb6076554/bdk_electrum

Co-authored-by: 志宇 <hello@evanlinjin.me>
Co-authored-by: LLFourn <lloyd.fourn@gmail.com>

This completes the move of things from https://github.com/LLFourn/bdk_core_staging

I suspect the latest version of HWI just broke everything

Disabled warnings for nursery/tmp_plan as it's going to be replaced
anyways

Explicitly sets the project MSRV so that clippy won't give warnings
for feature added after our MSRV

- rewrite some parts of the code to deal with older borrow checker
- downgraded hashbrown

There's a huge todo!() for the AsyncClient

To be enabled again soon ™️

As mentioned by @LLFourn:

1. We have a "sparse chain" from which there is a subset of txids M that are missing from graph.
2. There is also another subset C that are in the graph but their positions have changed.
3. We used the Cow to avoid copying/duplicating in memory transactions in subset C and M

Instead in inflate_update we could remove transactions in subset M and just clone data in subset C (which is usually tiny).

Creates a separate async EsploraAsyncExt trait for the
async client using async-trait crate. It has thesame
methods as the EsploraExt trait for the blocking client.
This trait is implemented on the AsyncClient of the
rust-esplora-client crate.

Fixes include:
* Allow `bdk_esplora` to use async with tls
* Reorganize `bdk_esplora` crate to have separate files for
  async vs blocking
* Use optional dependencies for `bdk_esplora` async

LLFourn is squashing these to get them all signed:

Remove useless clippy allow

ci: use clippy action

[ci] remove check for features=default