Rate Limit API Calls #502

[amvanbaren]

Fixes #502

Testing steps

• Open this PR in Gitpod, wait for the workspace to fully initialize.
• Stop the server.
• Edit server/src/dev/resources/application.yml file, change capacity to 1 and unit to hours.
• Start the server.
• Send a request to the public API (/vscode or /api), it shouldn't get rate limited.
• Send another request to the public API, now it does get rate limited.