Bump sea-orm to 1.1.19 and change async runtime to tokio

[dcorral]

This PR bumps sea-orm version from 1.1.12 to 1.1.19 and also changes async runtime from async-std (deprecated) to tokio

[zoedberg]

This PR is incomplete, all sea-orm crates should be bumped, entity files should be regenerated as explained in https://github.com/RGB-Tools/rgb-lib/blob/master/migration/README.md and the async runtime should be changed also in the migration crate.

Anyway, currently rgb-lib is under massive changes, which involved also the bump of sea-orm. I will update you when you can rebase this PR.

[zoedberg]

Please drop the tokio features if actually unneeded, address the suggested changes and then rebase on top of the latest master tip keeping a single signed commit.

[dcorral]

@zoedberg thanks for the review, all comments have been addressed and the branch is up to date with master. Please double check.

Let me know if there is any other change required. 🙏

[zoedberg]

@dcorral please check the requested changes and fix the formatting and lint

[zoedberg]

There are still some messy imports, please check the requested changes. Also the lint job is failing because you didn't generate the lock files for the bindings, run (cd ./bindings/c-ffi && cargo clippy) and (cd ./bindings/uniffi && cargo clippy) to fix those please

[zoedberg]

Looks good now, thanks