[PUI] Enable passing of string urls to apiUrl

[matmair]

This PR enables passing strings (preferably URLs) to API forms so they can be used with custom URLs / in plugins.

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[SchrodingersGat]

This will weaken the existing type checking checks which have already been useful in detection of mis-typed URLs. However I am not sure if there is a better approach here

[matmair]

I am very open to better implementations, this is just the most minimal API change I could come up with

[wolflu05]

In my opinion the idea behind this function is good, but the issue with it is, that if adding an api path, I basically have to go to two different files and add something on two places. That slows down the quick development. As the apiEndpoint function is just a huge switch case prefabricated building, why not just use an object with key: url and type the function accordingly. And then to allow strings, we add a second function that allows strings which gets called by the function which only allows ApiPaths. Because we cannot union string with choices. E.g. something like this:

export const API_PATHS = {
  "api-plugin-settings": "plugins/:plugin/settings/",
  // ...
}
export type API_PATH_TYPE = keyof typeof API_PATHS;

export function apiGenericUrl(path: string; ...) {
  // do  like before, but without the apiEndpoint call
} 

export function apiUrl(path: API_PATH_TYPE, ...args) {
  return apiGenericUrl(API_PATHS[path], ...args)
}

That way we would

1. only need to change something at one place
2. only need to import the apiUrl function
3. have the possibility to use raw strings without mixing them

[SchrodingersGat]

@wolflu05 I'd suggest making that as a separate issue :)