Enhancement: typed output of commands

[LarsKumbier]

The current implementation exposes very low-level information on the result of a command with the interface

export interface IDockerComposeResult {
  exitCode: number | null;
  out: string;
  err: string;
}

This has the disadvantage of leaving the interpretation of the output to the user, leading in a lot of boilerplate code that all users of docker-compose have to write. Instead it would be better to provide more introspective into the result by typing it:

export interface IDockerComposeResult<T> {
  exitCode: number | null;
  out: string;
  err: string;
  result: T | null;
}

This should be given for every mapped subcommand of docker-compose. An example for the port subcommand:

interface IDockerComposePortResult {
  address: string;
  port: number;
}

If an error occurs, the result should be null, since the error output will already be present in the err key.

We should use github's project to track, which subcommands have already been enhanced.

Originally posted by @stefanmeschke in #52 (comment)

[AlexZeitler]

@LarsKumbier

We should use github's project to track, which subcommands have already been enhanced.

Would you use notes for each subcommand or use this issue and add a todo list to it?