Fetch env for bootstrapping.

GetRequestID gets the request id if its already set in the given context if there is no requestID set then it'll create a new request id and returns the same.

NewContext adds core key-value e.g.

WithRequestID adds a request if to the context and gives the updated context back if the passed requestID is empty then creates one by itself.

Config contains application configuration values.

DB holds the application db connection.