chore: remove bdk dependency on log and dev dependency on env_logger

[notmandatory]

Description

As suggested by @TheBlueMatt we shouldn't use the log crate because even though it is a rust-lang project is may depend on some other crates that aren't as well maintained. Since we were only use log in a few places and not it any other bdk workspace projects except the bdk package I removed it.

Notes to the reviewers

For consistency I also removed the env_logger from the dev dependencies since it was only being used in a few places in a couple examples and println! is adequate for examples.

Changelog notice

None

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

[evanlinjin]

ACK 18e9e0a

[danielabrozzoni]

Should we open an issue to introduce some sort of diy logger as ldk does?

ACK 18e9e0a

[notmandatory]

Should we open an issue to introduce some sort of diy logger as ldk does?

I just created a placeholder issue.

[notmandatory]

rebased