fix: L-02 Incorrect Casts

[bmzig]

Orders inside the ERC7683OrderDepositor contract may be resolved either by the _resolve function or by the _resolveFor function. Both functions receive an order and convert it to the ResolvedCrossChainOrder struct, which contains the minReceived member of the Output[] type. However, inside both _resolve and _resolveFor functions, the minReceived member is initialized using the block.chainId cast to uint32, although the Output.chainId member is of type uint64. This means that the code will revert for blockchains with chainID not fitting into uint32, although it should work for all blockchains with chain IDs lower than type(uint64).max.

Consider casting block.chainId to uint64 instead of uint32 when initializing ResolvedCrossChainOrder.minReceived.

This commit changed the chainId field from a u64 to a u256, so the cast is now removed entirely.