feat: qlinear leaky relu

[chachaleo]

implementation of QLinear Leaky Relu

Pull Request type

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: #370

[raphaelDkhn]

Thanks @chachaleo.

Please don't forget:

• Don't forget to add trait description here. When you run docgen, it will create links in the doc.
• run scarb run docgen to generate the doc from docstring.
• Add operator in compatibility file
• Add operator in Summary file

[raphaelDkhn]

LGTM!