feat(gentool): expose WithDefaultQuery, WithoutContext and WithQueryInterface

[dushaoshuai]

• Do only one thing
• Non breaking API changes
• Tested

Do not know how to do testing things, but I’ve tested it in my own project and everything works fine.

What did this pull request do?

Expose WithDefaultQuery, WithoutContext and WithQueryInterface features to gentool.

User Case Description

1. command line flags

gentool -withDefaultQuery -withoutContext -withQueryInterface

2. yaml config

version: "0.1"
database:
  # ...
  # create default query in generated code
  withDefaultQuery: false
  # generate code without context constrain
  withoutContext: false
  # generate code with exported interface object
  withQueryInterface: false