Improve before and after internal logic

[sandydoo]

Consolidates and improves upon the work in #533 and #536.

• Removes before and after from the raw config, initially added in feat: ordering in hooks. #533. These are not valid pre-commit configuration options and should not be here.
• Removes code to filter out before and after from the raw config.
  There's nothing to filter out if they're not in the config in the first place. Essentially, reverts bugfix: remove before/after options from config json file #536.
• Adds a pretty-ish error message (most of the diff) if the hooks cannot be sorted. Instead of erroring out on an obscure missing result field, we now show:

         error: The hooks can't be sorted because of a cycle in the dependency graph:
  
         nixpkgs-fmt -> shellcheck -> typos
  
         which leads to a loop back to: shellcheck
  
       Try removing the conflicting hook ids from the `before` and `after` attributes of these hooks:
  
         {
           nixpkgs-fmt = {
             after = [ ];
             before = [ ];
           };
           shellcheck = {
             after = [ ];
             before = [
               "nixpkgs-fmt"
               "typos"
             ];
           };
           typos = {
             after = [ ];
             before = [
               "shellcheck"
             ];
           };
         }
  

• Sets id to the attr name of the hook, instead of the name. This corrects a mistake made in the module transition (Move to new module structure #397). Technically, a breaking change, but we haven't had feedback from the initial mistake.
• Exposes id in the options.