Add Change Contract Code Migration

[janezpodhostnik]

ref: onflow/cadence#2989

[turbolent]

Nice!

I'll see which contracts need to be updated and add them. This will need to support all networks

[turbolent]

I guess we can use SystemContractsForChain to get the names and addresses for each chain.

Currently it returns:

• Epoch-related contracts: FlowEpoch, FlowIDTableStaking, FlowClusterQC, FlowDKG
• Service account-related contracts: FlowServiceAccount, NodeVersionBeacon, RandomBeaconHistory, FlowStorageFees
• Token-related contracts: FlowFees, FlowToken, FungibleToken
• NFT-related contracts: NonFungibleToken, MetadataViews, ViewResolver
• EVM

Are all of them deployed at bootstrapping time and need to be updated by the migration?

Are there any other contracts that need to be updated using this migration?

cc @joshuahannan

[joshuahannan]

More contracts that I can think of that might be worth upgrading as part of this migration:

Tokens: FungibleTokenMetadataViews, FungibleTokenSwitchboard, FiatToken (USDC)
Marketplace: NFTStorefront, NFTStorefrontV2
Hybrid Custody: basically everything in this directory: https://github.com/onflow/hybrid-custody/tree/main/contracts
Core Contracts: LockedTokens, StakingProxy, FlowStakingCollection

These are all pretty important, but none of them are critical for core network operation as far as I know, so I'm not sure if they all need to belong in this migration, but I could probably make arguments for most of them.

[turbolent]

@joshuahannan Thanks! Can you please review e7e4a4f and check the values are correct (addresses, imports, code)?

It adds FungibleTokenMetadataViews, FungibleTokenSwitchboard, and LockedTokens, StakingProxy, FlowStakingCollection; for the remaining contracts the code is not easily available

[joshuahannan]

Looks good to me! We'll be starting on the other contracts soon

[turbolent]

@janezpodhostnik Can you please have a look at my changes? (cannot request a review from you, as you opened the PR)

[codecov-commenter]

Codecov Report

Attention: 185 lines in your changes are missing coverage. Please review.

Comparison is base (3c27e97) 55.99% compared to head (c272728) 56.21%.

Files	Patch %	Lines
...edger/migrations/change_contract_code_migration.go	28.01%	183 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5191      +/-   ##
==========================================
+ Coverage   55.99%   56.21%   +0.21%     
==========================================
  Files         649      995     +346     
  Lines       63379    95260   +31881     
==========================================
+ Hits        35492    53551   +18059     
- Misses      25321    37728   +12407     
- Partials     2566     3981    +1415     

Flag	Coverage Δ
unittests	56.21% <28.01%> (+0.21%)	⬆️

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[janezpodhostnik]

Looks good besides one comment.