Running Clippy + `rustfmt` and add them to CI

[mohammadfawaz]

When I was working on #120, I noticed that Clippy and rustfmt are not run in this project. I didn't run them in #120 to avoid polluting the PR but I thought I'd do them in a separate PR. Feel free to reject this but I've personally always found that rustfmt and Clippy highly improve the quality of the code in a Rust project.

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (431132b) 76.05% compared to head (9ab9b60) 76.02%.

Files	Patch %	Lines
src/scip.rs	50.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #121 +/- ## ========================================== - Coverage 76.05% 76.02% -0.03% ========================================== Files 13 13 Lines 1737 1739 +2 ========================================== + Hits 1321 1322 +1 - Misses 416 417 +1 ```

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[mohammadfawaz]

@mmghannam what do you suggest I do regarding the code coverage failures?

[mmghannam]

@mmghannam what do you suggest I do regarding the code coverage failures?

Well, they just failed because rustfmt sperated a method call to 3 lines instead of 1, nothing to worry about. So in this case it's easy we just ignore it 😄

[mohammadfawaz]

Thanks a lot @mohammadfawaz! This would improve the future contributions of this repo a whole lot! One thing I'm concerned about is the need to add this #[allow(clippy::too_many_arguments)] before some function definitions for which all arguments are necessary I believe and it bloats the repo a bit. Anyways I believe this does more good than harm in general.

Good point regarding the annoying annotation. We can instead add the following to Cargo.toml:

[lints.clippy]
too_many_arguments = "allow"

I'll open a separate issue to track that.