SDTT-238-Update-ESLint-config-in-OSLO-UML-Transformer

[KristofVDB1]

• added a .prettierrc that contains the configuration for prettier. This should help streamline the code syntax across multiple developers
• Added eslint-config-prettier and eslint-plugin-prettier as devDependencies into the project to streamline the use of both eslint and prettier.
• Added an ignore rule in one of the files due to conflicting eslint rules
• ran eslint:fix after these changes