[PVM] replace nil-signers Sign with Initialize, make syncGenesis private #370
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Why this should be merged
CaminoState.SyncGenesis is only called from the same package, exactly as intended, so there is no need to export this method.
txs.NewSigned calls txs.Sign. If nil signers arg is passed, than Sign method results only in setting signedTx bytes and unsignedTx bytes to tx fields, no actual signing is performed, though it still does things like calculating unsigned tx hash for signing purposes. There is no need in it. Replace all those calls with tx.Initialize which does same bytes initialization (as done in some of avax methods).
How this works
CaminoState.SyncGenesis -> CaminoState.syncGenesis
txs.NewSigned(txs.Codec, nil) -> txs.Initialize(txs.Codec)
How this was tested
Existing unit and e2e tests.
Additional references
Original PR based on cortina-15 dev
#345