54d768412abf218d2646aba211bb79b9dd287118 Sqlite migrations should either succeed or fail (Vladimir Fomene)
369e17b8012df56587c10cd9ce6651908d6a4be9 Add datatype for is_spent sqlite column (Vladimir Fomene)
Pull request description:
### Description
During table creation, Sqlite does not throw an error when a column datatype is not defined. In addition, the datatype provided during table creation does not put a constraint on the type of data that can be put in that column. So you can easily put a string value in an integer column. Despite this, I think it is important for us to add the datatype for clarity.
### Notes to the reviewers
You can read more about how Sqlite dynamic typing [here](https://www.sqlite.org/faq.html). I have amended our `migrate` code with a new commit. The idea is to run migrations in a transaction so that they either succeed or fail. This prevents us from having the database in an inconsistent state at any point in time.
### 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:
* [ ] 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
ACKs for top commit:
rajarshimaitra:
tACK 54d768412abf218d2646aba211bb79b9dd287118
afilini:
ACK 54d768412abf218d2646aba211bb79b9dd287118
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c3faf05be9