Remove field accessors from GenesisConfiguration

[Jimbo4350]

Description

Remove field accessors from GenesisConfiguration

Linked issue

https://iohk.myjetbrains.com/youtrack/issue/CDEC-299

Type of change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🛠 New feature (non-breaking change which adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
• 🏭 Refactoring that does not change existing functionality but does improve things like code readability, structure etc
• 🔨 New or improved tests for existing code
• ⛑ git-flow chore (backport, hotfix, etc)

Developer checklist

• I have read the style guide document, and my code follows the code style of this project.
• If my code deals with exceptions, it follows the guidelines.
• I have updated any documentation accordingly, if needed. Documentation changes can be reflected in opening a PR on cardanodocs.com, amending the inline Haddock comments, any relevant README file or one of the document listed in the docs directory.

Testing checklist

• I have added tests to cover my changes.
• All new and existing tests passed.

QA Steps

Screenshots (if available)

[ruhatch]

Nice - they weren't even using these ones 🤦‍♂️

[mhuesch]

LGTM. Just curious, why the small PR? Aren't there other partial functions in core that could now disappear? Or is that blocked on switching to deriveIndexedBi?

[Jimbo4350]

I thought there would be partial functions to remove but they weren't using these accessors anywhere in the repo!

[erikd]

Failed due to:

    C:\w\wallet-new\src\Cardano\Wallet\WalletLayer\Kernel.hs:30:1: error:
        Could not find module `Pos.Util.BackupPhrase'
        Use -v to see a list of the files searched for.
       |
    30 | import           Pos.Util.BackupPhrase
       | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I've got a fix for that in #3135 .

[erikd]

Winning!

[rvl]

I think this change breaks a FromJSON instance.

cardano-node: ConfigurationParseFailure "/nix/store/n1l77r7gaals3ssbhprlqn4b9c9bwd5b-cardano-sl-config/lib/configuration.yaml" (AesonException "Error in $['mainnet_staging_short_epoch_wallet_win64'].core.genesis: When parsing the constructor GCSrc of type Pos.Core.Configuration.Core.GenesisConfiguration expected Array but got Object.")