feat: add quality of life additions

[timvancann]

• get absolute intervals in scales
• display of intervals in note notation
• set intervals correctly on scale initialization

Ran rustfmt on code base and added cargo fmt --check to pipeline

[ozankasikci]

Hi @timvancann , thanks for the PR!

It seems that there are some nice additions to the codebase in the PR, however, formatting changes make it hard to review the actual changes. Would it be possible to remove the irrelevant changes and only leave the changes for the scales and intervals?

[timvancann]

Hi @ozankasikci,

Good point, I've removed all formatting changes.

Cheers!

[ozankasikci]

Thanks @timvancann ! LGTM, merged.