Add `cargo fmt` and `cargo clippy` to CI

[FantasyTeddy]

The following changes were made to the CI script:

• Rename the script to check since test does not properly reflect its role.
• Split the jobs for building and testing
• Add the cargo fmt check
  • Ran cargo fmt on the entire project to pass this check
• Add the cargo clippy check
  • Fix the following warning in datetime.rs:

    use of deprecated associated function chrono::FixedOffset::east: use east_opt() instead

• Replace actions from the unmaintained action-rs organization

[ohadravid]

Nice! Thanks for working on this 😄

[FantasyTeddy]

Thanks for merging 😄