Add the genesis hash to the database

[tomaka]

Close #476

[mergify]

Automatically approving tomaka's pull requests. This auto-approval will be removed once more maintainers are active.

[github-actions]

twiggy diff report

Difference in .wasm size before and after this pull request.

---

 Delta Bytes │ Item
─────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────
      +11258 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h256002580f1a5590
      -11258 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h4e5535d74f64a010
       -6016 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h2cfcd4756022494a
       +6016 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h69fcd5c134c48e5f
       +5947 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h0759ce8993c608ca
       -5947 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h25301baaa6187ac0
       -4535 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h549529d6c485484d
       +4535 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hd21e21b93f03f928
       -3219 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hccc18bf28263ab13
       +3219 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::he823621df131fbca
       +2888 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h80d1eeb744d54977
       -2888 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hd0c91d815c239c7b
       +2615 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hc4d82b56f24fdf86
       -2615 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hfba2ebb862d1f219
       -2061 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h37cd9fb9d37b1b6e
       +2061 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hab69e5ac0afc3ef0
       +2045 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hbfae38100a2f0271
       -2045 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hc30da7609fdd4925
       +1959 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h64e277f403da20b6
       -1959 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hba67734a1ba502b0
       +4449 ┊ ... and 498 more.
       +5953 ┊ Σ [518 Total Rows]