host_limiterでhostごとにreq limitを設定できるようにする #15
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host limiterでhostごとにreq limitを指定できるようにします。
window lenは全体設定をそのまま使うようになっているので、ここも書き換えられるようにしても良いと思いますが、ひとまずこのようにしています。
後方互換性は担保してあります(mapはデフォルトで初期化され、opt-inで使えるイメージです)
フィールドを公開するのではなくfunctional option patternで注入できるようにするアイデアもありましたが、
現在settersはbase limiter用に使われているのでフィールド自体を公開しています。