📛 Rename this tool

[shnizzedy]

Related problem

It's hard to talk about this tool (cpac) and the tool it wraps (C-PAC) without being super wordy.

Proposed feature

We rename this tool cpac-wrapper or cpac-cli or somesuch

Acceptance criteria

• https://github.com/FCP-INDI/cpac and https://github.com/FCP-INDI/C-PAC no longer have the same initialism as their names

Alternatives

We move this project into the main repo and package them together?

Additional context

• When we did an initial evaluation of C-PAC for NMIND, people seemed very confused about how cpac and C-PAC would have different versions (0.4.0 and 1.8.3, respectively).
• The is something of a revisit of 📛 Name this package (for clarity on GitHub and PyPI) shnizzedy/cpac#2