Port over `cdp_viewer.OutputViewer` and remove `cdp` dependency

[tomvothecoder]

Description

This PR ports over the cdp_viewer.OutputViewer module that is used by all of the viewer modules in e3sm_diags. It also removes the cdp dependency entirely from e3sm_diags. No other code was changed and the viewer output behaves the same.

• Example output: https://portal.nersc.gov/cfs/e3sm/vo13/examples/628_ex1_modTS_vs_modTS_3years/viewer/lat_lon/index.html (same as https://portal.nersc.gov/cfs/e3sm/vo13/examples/ex1_modTS_vs_modTS_3years/viewer/lat_lon/index.html)
• Closes #628

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules

If applicable:

• [ ] New and existing unit tests pass with my changes (locally and CI/CD build)
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [ ] I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)