feat: Add support for loading / writing from files

[0xbe7a]

No description provided.

[github-actions]

(benchmark 10523297859 / attempt 1)
Base results / Our results / Change

Model	Size	Dump Time	Load Time
sklearn rf 20M	23.4 MiB / 3.0 MiB / 7.67 x	0.01 s / 0.03 s / 2.34 x	0.02 s / 0.03 s / 1.47 x
sklearn rf 20M lzma	6.5 MiB / 2.0 MiB / 3.21 x	9.67 s / 0.86 s / 0.09 x	0.41 s / 0.15 s / 0.37 x
sklearn rf 200M	238.8 MiB / 30.8 MiB / 7.75 x	0.15 s / 0.23 s / 1.57 x	0.23 s / 0.38 s / 1.65 x
sklearn rf 200M lzma	48.8 MiB / 14.8 MiB / 3.29 x	72.18 s / 14.25 s / 0.20 x	3.18 s / 1.14 s / 0.36 x
sklearn rf 1G	1302.2 MiB / 168.0 MiB / 7.75 x	0.73 s / 1.14 s / 1.55 x	1.16 s / 1.87 s / 1.61 x
sklearn rf 1G lzma	262.4 MiB / 99.1 MiB / 2.65 x	372.80 s / 79.86 s / 0.21 x	16.11 s / 6.80 s / 0.42 x
sklearn gb 2M	2.5 MiB / 1.1 MiB / 2.16 x	0.02 s / 0.22 s / 8.89 x	0.03 s / 0.21 s / 7.43 x
sklearn gb 2M lzma	0.6 MiB / 0.2 MiB / 3.76 x	0.76 s / 0.36 s / 0.48 x	0.07 s / 0.23 s / 3.35 x
lgbm gbdt 2M	2.6 MiB / 1.0 MiB / 2.78 x	0.05 s / 0.18 s / 3.90 x	0.01 s / 0.12 s / 14.09 x
lgbm gbdt 2M lzma	0.9 MiB / 0.5 MiB / 1.90 x	0.89 s / 0.36 s / 0.40 x	0.06 s / 0.11 s / 1.98 x
lgbm gbdt 5M	5.3 MiB / 1.9 MiB / 2.81 x	0.09 s / 0.35 s / 3.77 x	0.02 s / 0.17 s / 10.20 x
lgbm gbdt 5M lzma	1.7 MiB / 0.8 MiB / 1.96 x	2.15 s / 0.73 s / 0.34 x	0.11 s / 0.22 s / 2.12 x
lgbm gbdt 20M	22.7 MiB / 7.6 MiB / 3.00 x	0.38 s / 1.45 s / 3.79 x	0.07 s / 0.75 s / 10.47 x
lgbm gbdt 20M lzma	6.3 MiB / 3.0 MiB / 2.09 x	12.10 s / 3.44 s / 0.28 x	0.41 s / 0.88 s / 2.16 x
lgbm gbdt 100M	101.1 MiB / 33.0 MiB / 3.06 x	1.78 s / 6.63 s / 3.73 x	0.36 s / 56.62 s / 157.80 x
lgbm gbdt 100M lzma	25.6 MiB / 10.6 MiB / 2.41 x	57.84 s / 16.89 s / 0.29 x	1.67 s / 3.74 s / 2.24 x
lgbm rf 10M	10.9 MiB / 3.2 MiB / 3.46 x	0.17 s / 0.42 s / 2.42 x	0.03 s / 0.27 s / 9.81 x
lgbm rf 10M lzma	0.7 MiB / 0.4 MiB / 1.86 x	1.22 s / 0.60 s / 0.49 x	0.08 s / 0.30 s / 3.72 x