Add ggml-model-*.bin checksums for 7B, 13B, 30B

[sw]

With the recent flurry of new formats, I didn't want to keep the *.pth files around. So here are the SHA-256 checksum of the ggml model files up to 30B.

Unless I've missed something in the recent commits, model quantization should still be deterministic.

[prusnak]

I'll check these and also try to provide 65B values

[prusnak]

1. I checked the hashes provided in the first commit
2. I computed the 65 hashes and added them as a second commit

LGTM