Option to completely disable check for spaces in install path

### Checklist

- [x] I added a descriptive title
- [x] I searched open requests and couldn't find a duplicate

### What is the idea?

The `check_path_spaces` option issues a message either as an error (that blocks the installation) or as a warning (that allows the installation to continue). There should be an option to disable the warning completely for installer authors who are confident that spaces are not going to cause their users any issues.

### Why is this needed?

The warning in the installer is likely to scare users even if spaces have been determined to be necessary/acceptable by the installer author. As a result there should be an option to disable the message completely.

### What should happen?

The `check_path_spaces` setting should offer the ability to error, warn or to be disabled entirely.

### Additional Context

While this option would be good, it would be better if `conda create` and `conda-build` addressed their own issues/warnings with respect to spaces in paths. On Windows 'Program Files' is a common place for people to install to!