Added support for Eva readers with known aliases

[brandonzhu09]

Description

Updated the backend to support a fixed set of Eva readers with known aliases for the Observation, Variable, Group data model for assimilated diagnostics. Added a timestamp for recently added experiments and enforced an enumerated plot type and cycle times in the plots model. Rewrote passing Django views and models testing to reflect the new database schema changes.

Issue(s) addressed

Resolves #25

[asewnath]

If you add keywords close, fix, or resolve (in any tense) in front of the linked issue in the PR description, the issue will be closed automatically once this PR is merged. https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue

[brandonzhu09]

If you add keywords close, fix, or resolve (in any tense) in front of the linked issue in the PR description, the issue will be closed automatically once this PR is merged. https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue

Thanks for the tip! I didn't realize you could do that.

[asewnath]

Is this ready to be merged?

[brandonzhu09]

Is this ready to be merged?

Yes, it's ready!