Implement single runner

[W2Wizard]

Single runner 🏃

Add the ability to POST code directly to the webserver. At the moment it will support only C but adding support to other languages can be customized via the Docker image and bash scripts.

API JSON Body:

curl -XPOST -H "Content-type: application/json" -d '{
    "code": "#include <stdio.h>\nint main(void) { printf(\"Hello World!\"); return 0; }",
    "flags": "-Wall -Wextra -Werror",
    "args": "a;b;c",
    "timeout": 10,
    "language": "c"
}' 'http://localhost:8000/api/grade/single'

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[W2Wizard]

Merged, though a bit messy because I did a little oopsie