celo-migrate script - M4

[alecps]

The migration script will be used by many people and should be as easy and fool-proof to use as possible.

Tasks

Beta Give feedback

1. Add pre-migration step to migrate script #171
   3 of 3
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2. Export genesis config after migration #159
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3. Decide behaviour when overwriting state during migration #173
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4. Update the migration script documentation #203
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5. Test migration on archive alfajores datadirs #201
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6. migration: Enable Granite #226
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7. migration: Overwrite create2deployer code #233
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[piersy]

need to split into ux and fixes epics

[alecps]

Just flagging that this epic is closely related to https://github.com/celo-org/celo-blockchain-planning/issues/419

[lvpeschke]

@alecps what's missing here at this point? Can this be closed before end of week?

[lvpeschke]

@alecps ping