Using magic number to detect file ext and mime type

Instead of relying on the file extension and header content type, now we make use of magic number to pull the file ext and mime type by inspecting it's content.

Commits

• chore(deps-dev): update husky requirement from ^2.7.0 to ^3.0.0 b06778a
• fix: .snyk & package.json to reduce vulnerabilities 6ff6106
• chore(package): update dependencies 24c98c4
• feat: detect file mime type and ext using magic number 8b913cc