`chain-spec`: support for `json` config/patch (and `GenesisBuilder` API)

[michalkucharczyk]

This PR is a step towards adding support of RuntimeGenesisConfig into the wasm runtime:

In this PR:

• all references to RuntimeGenesisConfig in node/service are removed,

• RococoGenesisExt is removed. It was the hack to allow overwriting EpochDurationInBlocks. Removal of RococGenesisExt prevents from manipulating the state to change the runtime constants, what allows to keep metadata const.

• all (kusama|polkadot|versi|rococo|wococo)_(staging|dev)_genesis_config functions now return the JSON patch for default runtime GenesisConfig,

• ChainSpecBuilder is used, ChainSpec::from_genesis is removed,

• rococo-runtime changes:

  • Explicit building of fast-runtime version of rococo-runtime is no longer done.
  • Environment variables which control the time::EpochDurationInBlocks value were added:
    • ROCOCO_FAST_RUNTIME - enables the fast runtime version of runtime with default value of EpochDurationInBlocks set to 10. Value of env does not matter.
    • ROCOCO_EPOCH_DURATION - enables the fast runtime version with provided value of EpochDurationInBlocks (epoch duration will be set to the value of env).

  rococo-runtime building examples:

  • to build runtime for versi_staging_testnet which had EpochDurationInBlocks set to 100:

    ROCOCO_EPOCH_DURATION=100 cargo build -p rococo-runtime
    

  • to build runtime for wococo_development

    ROCOCO_EPOCH_DURATION=10 cargo build -p rococo-runtime
    or
    ROCOCO_FAST_RUNTIME=1 cargo build -p rococo-runtime
    

  • to build versi-staging chain spec:

    ROCOCO_EPOCH_DURATION=100 cargo run -p polkadot -- build-spec --chain versi-staging --raw 
    

  • to build wococo-dev chain spec:

    ROCOCO_EPOCH_DURATION=10 cargo run -p polkadot -- build-spec --chain wococo-dev --raw 
    

Companion for: paritytech/substrate#14562 cumulus companion: paritytech/cumulus#2936

Step towards: https://github.com/paritytech/polkadot-sdk/issues/25

[michalkucharczyk]

bot rebase

[paritytech-processbot[bot]]

Rebased

[michalkucharczyk]

bot rebase

[paritytech-processbot[bot]]

Rebased

[michalkucharczyk]

bot rebase

[paritytech-processbot[bot]]

Rebased

[paritytech-cicd-pr]

The CI pipeline was cancelled due to failure one of the required jobs. Job name: test-linux-stable Logs: https://gitlab.parity.io/parity/mirrors/polkadot/-/jobs/3322577

[michalkucharczyk]

@paritytech/devrel , @the-right-joyce

I wanted to give you a heads-up about some changes that have just been made in this PR. I've modified the default EpochDurationInBlocks for several ChainSpecs, namely: versi-local, wococo-local, rococo-local, wococo-dev, versi-dev, rococo-dev (where duration was previously set to 10), and versi-staging (where duration was previously set to 100).

You can find additional details in the PR description.

This change could affect tutorials (and docs maybe?) that rely on timing within these runtimes. Therefore, I request you to please review and update them accordingly, and include information on how to adjust timings based on these changes.

Thank you for your attention.