crypto: Add multisig to sui

[joyqvq]

Main changes are in multisig.rs, signature.rs crypto.rs

Design doc: https://github.com/MystenLabs/sui/issues/7187 See test: https://gist.github.com/joyqvq/5febd8deb5cacc6f47afa1253224b7da

Next step:

• [ ] Typescript util to compute multisig address
• [ ] Typescript util to combine partial sigs
• [ ] Explorer rendering of multisig

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[joyqvq]

https://github.com/MystenLabs/sui/issues/7187 linked design doc in this issue

[LeviHHH]

We should also consider supporting secp256r1 signature verification in the move library.

[joyqvq]

We should also consider supporting secp256r1 signature verification in the move library.

https://github.com/MystenLabs/sui/pull/7773

[joyqvq]

@kchalkias @benr-ml addressed most of the comments PTAL