entproto: make it possible to configure generated output so that it can work with Buf/Connect

[ivanvanderbyl]

Hi Team,

This PR adds some extra configuration to the generate Hook so that it can output generated code that works with BufBuild's Connect.

Specific changes:

• Make all method names unique so that specific keys don't collide or generate the method delete() in JS, and follow the naming conventions specified by the linter.
• Don't create the generate.go file since we're using buf generate instead of protoc.
• Allow configuring the generation target so we can collocate generated .proto with other hand written files outside of ./ent