Extract some basic shared code into utils file and bundle it. Simplify lib exports...

Extract some basic shared code into utils file and bundle it. Simplify lib exports. Introduce new typings for server config and PoW results. Clean up CLI and fix some minor issues. Limit Node heap to improve CLI and server performance. Refactor server to extract code into manageable helper functions, improve organization, and fix some minor issues. Restrict difficulty to maximum of network difficulty to mitigate DoS attacks. Merge shared code in work calls in GPU implementation and extract it into modular functions. Implement work queue to better manage inbound requests. Fix nonce check in compute shader. Fix test page benchmark results from not being sorted properly. Update server test script.