modify code generation to reduce whitespace

@alexcjohnson wrote:

• We should be able to reduce the whitespace significantly, to make the file smaller. Could even collapse it to a single line, I'm not sure there's much value keeping it human-readable, but maybe @emilykl has opinions about this. If we really want to optimize file size we could also change its structure a bit - like if every entry is a dict {params, superclass} this could be converted to a length-2 list. But the whitespace is the biggest piece of this.
• json.load is pretty fast, ~41ms on my computer. But it's even faster if we just make this a Python file. In my quick test I just added:

true=True
false=False
null=None
v = 

to the beginning of the file to convert the JSON to Python, and then from validators._validators import v took only ~25ms. (If we do this for real we should be able to tweak the json.dump to output Python in the first place so we don't need to alias true, false, and null).

La issue fa riferimento ai dati generati di validators._validators e al percorso di generazione JSON, ma non indica alcun file del repository né alcun test. Inizia individuando il generatore e il modulo generato, quindi confronta l'output attuale di json.dump con la rappresentazione compatta o Python proposta. Il lavoro è completato quando il file generato è più piccolo, i suoi dati rimangono caricabili e il comportamento esistente del validator è preservato.