[Feature Request] Pull request title based on files diff

Context

I know that the purpose of the CLI is to help create commit messages, but it would be nice to have the option to suggest pull request titles based on differences in modified files.

In this example, the user should copy the suggested title, I don't think there's a simple way to automate this.

Example

➜ opencommit --pull-request
┌  open-commit
│
◇  1 staged files:
  example-repo/test.js
│
◇  📝 Commit message generated
│
└  Commit message:
——————————————————
* feat(test.js): add test file
——————————————————

│
◇  Confirm the commit message
│  Yes
│
└  ✔ successfully committed

│
└  [main] * feat(test.js): add test file
 1 files changed, 1 insertions(+), 0 deletions(-)

│
◇  📖  Pull Request title generated
│
└  Pull Request title:
——————————————————
* feat: Create sample test file
——————————————————

│
◇  Do you want to run `git push`?
│  Yes
│
◇  ✔ successfully pushed all commits

Start by locating the CLI flow for the --pull-request option and the existing commit-message generation flow. Implement the requested pull-request title suggestion from the modified-file diff, then verify that the example flow displays the title before the push prompt.