Simplify the database content by restoring chain information from the database

[tomaka]

Close #1752

This PR removes a lot of fields from the database, as the values of these fields is now computed from the runtime of the finalized block when the client initialized.

While this PR is fully ready, I'm opening it as a draft. Unfortunately, the runtime functions used by the chain information builder weren't always available, and so the loading might fail. This needs to be first figured out.

[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.

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[tomaka]

Blocked on #2930

[tomaka]

Since #2930 is not doable, this is instead blocked on #165.