Support dynamic import

[oneut]

Overview

• Support dynamic import
  • For the following reasons, it is a breaking change.
    • Because of asynchronous circumstances, route sh.ould be managed by the callback.
• Update tests.
• Add commitizen
  • Because I wanted to add the rule for git commit.
  • So, husky is updated for git hook conflict.

[coveralls]

Coverage remained the same at 100.0% when pulling 54ce885 on 2.0-dev-support_dynamic_import into c2f32fc on 2.0-dev.