Fix RuntimeUpgradeTracker

[turuslan]

• Rococo fails executing block 2848657 #1416
  • try find small fix for code selection.
  • find out how substrate caches code.

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Current RuntimeUpgradeTracker needs to know (all block headers to know) blocks where runtime upgrade happened.
This block is used as caching key for wasm code/module.
Sometimes we don't want/have all block headers (e.g. warp sync).

RuntimeUpgradeTracker can work without knowing all block headers.
Caching can be simplified:

1. It can always retrieve correct runtime wasm code from block state.
2. Block without runtime upgrade digest has same runtime wasm code as it's parent.

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If we can't rely on RuntimeEnvironmentUpdated digest, then we need to store either code_hash: hash or runtime_upgraded: bool for each block that was either executed (and :code was set by wasm) or checked for upgrade with trie_diff(key=":code").
Finalized blocks can be compressed, by using range of numbers instead of block hash ([0, 1, ..., 100] => [0..100])