State trie migration

[shunsukew]

Description

State trie has been optimized by paritytech/substrate#9732, and once state_version set to 1 by #567, lazy state trie migration is ongoing.
However, this takes long time, and it is blocker for Warp sync integration #901, we should hasten its completion by using dedicated pallet for this purpose.

https://github.com/paritytech/substrate/blob/master/frame/state-trie-migration/src/lib.rs
https://hackmd.io/@kizi/HyoSO3lf9

This can also improve PoV size reduction at the same time allowing us to use warp sync.

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