Merge bitcoindevkit/bdk#1028: Add CreateTxError and use as error type for TxBuilder...

00ec19ef2d59b6268424105f3d1947ab637b8c0c ci: fix MSRV pinning for rustls 0.21.9 (Steve Myers)
77f9977c02683071748f5fd6d07bde4b2d1f4a12 feat(wallet): Add infallible Wallet get_address(), get_internal_address functions (Steve Myers)
9e7d99e3bf9687251930c9a6bc5f1fe6a7c78bcb refactor(bdk)!: add context specific error types, remove top level error mod (Steve Myers)

Pull request description:

  ### Description

  To remove some places where there were `.expect("TODO")` I added a new `CreateTxError` type which is returned from `TxBuilder::finish()`. I also updated related tests and doc tests.

  Fixes https://github.com/bitcoindevkit/bdk/issues/996#issuecomment-1621036206

  Also added fallible `Wallet::try_get_address()` and `try_get_internal_address()`  to return `Result` with a possible `D:WriteError` when a PersistBackend is used. This should fix #996.

  I removed catch-all bdk::Error and replaced usages with new types and updated related functions, fixes #994.

  ### Notes to the reviewers

  ~~I didn't add all possible bdk::Error types that `Wallet::create_tx()` and `TxBuilder::finish()` functions might throw. It's probably not too much more work but will take a bit more research so I want to make sure this is the right general approach first.~~

  I added `anyhow` to the dev-dependencies so I could remove some `.expect()` lines from the docs tests and make the examples closer to what an end user should do.  I also used the `anyhow!()` macro to replace a few places that were using the `bdk::Error::Generic` in example code.

  I also moved the module level error.rs file to wallet/error.rs so no one would be tempted to make any new catch all errors and to make it clear that all the errors in it are wallet module related.

  ### Changelog notice

  Changed

  - Updated bdk module to use new context specific error types
    - wallet: MiniscriptPsbtError, CreateTxError, BuildFeeBumpError error enums
    - coin_selection: module Error enum
  - Renamed fallible Wallet address functions to try_get_address() and try_get_internal_address()

  Removed

  - Removed catch-all top level bdk::Error enum
  - Removed impl_error macro

  Added

  -  Added infallible Wallet get_address(), get_internal_address functions

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

  #### Bugfixes:

  * [x] This pull request breaks the existing API
  * [ ] I've added tests to reproduce the issue which are now passing
  * [ ] I'm linking the issue being fixed by this PR

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Tree-SHA512: a87c0856d71f9c945d12b6de6d368f49bd62d73886ac46ac83d00ddb81f2c38c5233ba053e40c76dea73ee7bfc19dac510eec5d7c9026ae50a2dc7308ac4786f