Sovereign accounts and EVM system layer (#94)

[dmitrylavrenov]

• Sovereign accounts and EVM system layer (Sovereign accounts and EVM system layer #86)

• Frame evm system (Frame evm system #62)

• Add initial impl of evm-system

• Check account existence

• Improve creation account logic

• Add new line

• Add default implementations

• Add mock

• Use DispatchResult instead of custom enums

• Basic create account tests

• Add simple tests with remove account and nonce update

• Remove default implementations for OnNewAccount and OnKilledAccount

• Add mock objects for OnNewAccount and OnKilledAccount

• Use mock logic in tests

• Some tests improvements

• Add docs to tests

• Check events in tests

• Add default implementation for OnNewAccount and OnKilledAccount for empty tuple (Add default implementation for OnNewAccount and OnKilledAccount for empty tuple #63)

• Implement StoredMap for EvmSystem (Implement StoredMap for EvmSystem #64)

• Add try-runtime feature into pallet-evm-system (Add try-runtime feature into pallet-evm-system #67)

Add try-runtime feature at pallet-evm-system

• Use sp_std library to add FromStr trait for tests at pallet-evm-system (Use sp_std library to add FromStr trait for tests at pallet-evm-system #68)

Use sp_std library to add FromStr trait for tests at pallet-evm-system

• Rename FullAccount into Account at pallet-evm-system (Rename FullAccount into Account at pallet-evm-system #69)

Rename FullAccount into Account at pallet-evm-system

• Fix try_mutate_exists implementation and add tests to check it (Fix try_mutate_exists implementation and add tests to check it #70)

• Fix try_mutate_exists logic

• Add tests

• Fix AccountData type at mock

• Remove redundant mock expectations

• Add comments for new tests

• More explicitly handle (none,false) case

• Rename some_data back to maybe_account_data

• Add data changes for try_mutate_exists_fails_without_changes test

• Add try_mutate_exists_account_not_created test

• Add assert_noop to check state chages

• Return success for try_mutate_exists_account_not_created test

• Use workspace deps

• Remove license

• Implement missed AccountProvider for EvmSystem

• Remove deprecated trait Store

• Add Apache-2.0 license

• Remove deprecated storage getter