feat: upgrade bdk to 1.0.0-alpha.2

This is a big change that updates some of our build infrastructure
as well as upgrading the bdk dependency. It adds the simple
new_no_persist constructor on the wallet as well as the blocking
esplora client.

.github/workflows/publish-python.yaml

@@ -29,6 +29,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           submodules: true
+      # TODO 2: Other CI workflows use explicit Rust compiler versions, I think we should do the same here
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable