Split lib w/bytecode reduction

[ryley-o]

Description of the change

PoC of V3 Engine Flex with bytecode size reduction.

It appears that Solidity doesn't do a great job of efficiently using bytecode space when doing the following for external libraries:

• using syntax using X for Y
• calling a public function (on an external library) in > 1 place

In this example, all calls to public function on bytecode storage reader library are performed in a single internal helper function, and the using X for Y syntax is removed for the external library.

Bytecode Impacts

The result is a net-change from 24.010 bytes (on splitLib) to 23.909 bytes on this branch, for GenArt721CoreV3_Engine_Flex.sol (possible to get down to 23.865 if we kept optimizer at 10 like it is on splitLib branch)

With respect to current main branch, the change is 23.878 bytes (on main) to 23.909 bytes on this branch, for GenArt721CoreV3_Engine_Flex.sol. (both have optimizer at 25)

Alternate options

Also note that if we don't like this change for readability reasons, there are other ways to reduce bytecode to <24 kb. For example, changing variables from constants to non-constants reduces bytecode size a lot (e.g. bytes32 constant FIELD_NEXT_PROJECT_ID = -> bytes32 FIELD_NEXT_PROJECT_ID =)