feat(vue-tel-input): emit event objects for standard events

[erikbjoern]

This pull request proposes to include the actual event objects when emitting blur, focus, enter and space. This gives developers more control over side effects that may be triggered by those events.

[iamstevendao]

thanks @erikbjoern! could you help include the changes in the docs too, please? https://github.com/iamstevendao/vue-tel-input/blob/main/docs/usage/events.md