Change Password -> Cubit

[Hard-Coder05]

Is your feature request related to a problem? Please describe.

We need to design the cubit for Change Password Feature.

Describe the solution you'd like

1. should have states: Initial, Loading, success, error.
2. fake api repository.
3. tests.

[werainkhatri]

@divy-arpit

1. Never raise a PR to an issue not assigned to you
2. There is no api in the documentation for this issue. Please discuss before proceeding to a PR.

[Hard-Coder05]

@werainkhatri Should we make Change number issues to Change Password ???