chore: format all files with prettier

[Fredkiss3]

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Description

Main changes:

• format all files with prettier.
  Included files are:
  • everything in src
  • everything in server
  • some of the files located at the root directory (excluding yaml and markdown files), refer .prettierignore file to see excluded files: https://github.com/Fredkiss3/pangolin/blob/chore/fix-formatting/.prettierignore

Other changes:

• Added a job that checks that all files in are formatted correctly with prettier
• Added a job to run formatting accross the whole repo: npm run format
• Added .vscode/settings.json with some default options: setting prettier as the default formatter, and formatting on save
• Added .vscode/extensions.json with recommendations for new contributors recommending them to install prettier extension if not installed