Extract REPL integration to _lib folder

[talyssonoc]

The implementation for the REPL is written directly inside the integration module (https://github.com/talyssonoc/node-api-boilerplate/blob/main/src/_boot/repl.ts). We could extract it to inside the _lib folder as we do for the other integrations (https://github.com/talyssonoc/node-api-boilerplate/tree/main/src/_lib).

[jeferson-sb]

@talyssonoc Hey! Can I take this one?

[talyssonoc]

It's all yours!