feat(ris): add support for direct image upload

[LuanRT]

Description

This adds support for direct image upload (as suggested by #31, thanks!).

Usage

const my_awesome_image = fs.readFileSync('./wow.png');
const reverse = await google.search(my_awesome_image, { ris: true });
console.info(reverse.results);

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings