Support for mnemonic phrases in @solana/web3.js

[beeman]

Currently, any application that wants to support mnemonic phrases needs to look at how others implement this to maintain compatibility with the rest of the ecosystem.

It would be good to standardize this and implement it in an official Solana library like @solana/keypair (possibly together with the other Keypair classes).

Originally posted by @beeman in https://github.com/solana-labs/solana/issues/26342#issuecomment-1171925218

[Soldecv]

Currently, any application that wants to support mnemonic phrases needs to look at how others implement this to maintain compatibility with the rest of the ecosystem.

It would be good to standardize this and implement it in an official Solana library like @solana/keypair (possibly together with the other Keypair classes).

Originally posted by @beeman in #26342 (comment)

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