Description

Fix building example_cli by adding the bitcoin and rand dependencies so it, and the crates that depend on it, can be built independently and not only from the workspace.

Notes to the reviewers

I also added the build-examples CI job to verify we can build examples individually.

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

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