Update EigenDA proxy to match OP v1.7.6 client expectation

[teddyknox]

• moves LoadServer() and server.go into a new server package so that LoadServer() can be used in e2e_test.go (avoiding duplication of DI efforts)
• Removes GenericCommitmentByte from the returned commitment, since it is prepended by the OP client on the clients side..?
• Enable WithLogging() middleware
• Expand WithLogging() to support error logging, update handler signatures and implementations to tie into this
• Update path patterns to match the usage by the OP plasma client