feat: encrypt & decrypt with seeds

[ghost]

This PR introduces a method to create seeds instead of the regular store operation which creates secret shares. Default seed length is set to 64. In decrypt, it sorts the shares by length assuming they will either be all the same length, which means they will just be xored as before, or they will be different length, which means every share except the longest is a seed. This ensures backward compatibility as shares already uploaded would just be xored together.

[coveralls]

Pull Request Test Coverage Report for Build 14227522747

Details

• 15 of 15 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 14185699662:	0.0%
Covered Lines:	391
Relevant Lines:	391

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💛 - Coveralls

[jimouris]

Wait for @lapets to review before merging.

[psofiterol]

I just used the new/proposed nilql.py directly on secretvaults-py and run all the STORE examples, just to double check. All good 👍 .

Thanks for the heads up @jimouris 🙏