feat(ethexe): commit only head of blocks

[grishasobol]

instead of committing a vector of GearBlock, we commit now only hash of the last block in chain.
This should be considered as temporary solution and head have to be changed from block hash to announce hash, I will do in the next PR.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
ethexe/ethereum/WrappedVara.json	100% smaller
ethexe/ethereum/Mirror.json	95% smaller
ethexe/compute/src/prepare.rs	48% smaller
ethexe/consensus/src/validator/producer.rs	39% smaller
ethexe/consensus/src/mock.rs	35% smaller
ethexe/consensus/src/utils.rs	25% smaller
ethexe/common/src/gear.rs	20% smaller
ethexe/common/src/db.rs	17% smaller
ethexe/consensus/src/validator/participant.rs	8% smaller
ethexe/ethereum/src/abi/gear.rs	5% smaller
gprimitives/src/lib.rs	4% smaller
ethexe/common/src/primitives.rs	1% smaller
ethexe/observer/src/lib.rs	1% smaller
ethexe/blob-loader/Cargo.toml	Unsupported file format
ethexe/cli/Cargo.toml	Unsupported file format
ethexe/common/src/events/router.rs	0% smaller
ethexe/compute/Cargo.toml	Unsupported file format
ethexe/compute/src/compute.rs	0% smaller
ethexe/compute/src/lib.rs	0% smaller
ethexe/compute/src/service.rs	0% smaller
ethexe/compute/src/tests.rs	0% smaller
ethexe/consensus/Cargo.toml	Unsupported file format
ethexe/consensus/src/validator/initial.rs	0% smaller
ethexe/consensus/src/validator/mod.rs	0% smaller
ethexe/consensus/src/validator/subordinate.rs	0% smaller
ethexe/contracts/src/IRouter.sol	Unsupported file format
ethexe/contracts/src/Router.sol	Unsupported file format
ethexe/contracts/src/libraries/Gear.sol	Unsupported file format
ethexe/contracts/test/Base.t.sol	Unsupported file format
ethexe/db/Cargo.toml	Unsupported file format
ethexe/db/src/database.rs	0% smaller
ethexe/ethereum/Cargo.toml	Unsupported file format
ethexe/ethereum/Router.json	Unsupported file format
ethexe/ethereum/src/abi/events/router.rs	0% smaller
ethexe/ethereum/src/router/events.rs	0% smaller
ethexe/network/Cargo.toml	Unsupported file format
ethexe/observer/Cargo.toml	Unsupported file format
ethexe/processor/Cargo.toml	Unsupported file format
ethexe/rpc/src/apis/block.rs	0% smaller
ethexe/runtime/Cargo.toml	Unsupported file format
ethexe/service/Cargo.toml	Unsupported file format
ethexe/service/src/fast_sync.rs	Unsupported file format
ethexe/service/src/tests/mod.rs	0% smaller
ethexe/tx-pool/Cargo.toml	Unsupported file format
gprimitives/Cargo.toml	Unsupported file format
pallets/gear-builtin/Cargo.toml	Unsupported file format
pallets/gear-eth-bridge/Cargo.toml	Unsupported file format