beta/dev: migrate flow pallet to 3.0

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Stage 1

• open branch migration/flow

• update cargo.toml dependencies

• migrate structs to new macro syntax

• migrate storage to new macro syntax

• migrate events, errors to new macro syntax

• migrate pallet to new macro syntax

• add/fix commission calculation (fixed point arithmetic)

• write tests

• benchmarking

• add PR to main

Stage 2

Refactor assets to ORML:

• Network Transaction fees use local network native currency

• Deposits use GAME

• Payments use (depending on network) aUSD/PLAY/DAI/USDT

• suggest migration in architecture round

• extend this issue with new decisions

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how to test:

• pull secondary repository from https://github.com/playzero/zero-network
• update submodule for gamedao-protocol based on your commit hash
• build

your build should result in no warnings by your added functionality.