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).

この issue は生成された validators._validators データと JSON 生成経路を指摘していますが、リポジトリ内のファイルやテストを指定していません。まず generator と生成された module を特定し、現在の json.dump の出力を、提案されている compact 表現または Python 表現と比較してください。生成されたファイルが小さくなり、そのデータを引き続きロードでき、既存の validator の動作が維持されれば完了です。