Create Another Endpoint For Getting Terms

On the frontend we hard write the terms in the javascript itself—which isn't a lot of work as it's only updated every new term—isn't a good practice. There should always be a single source of truth.

```tsx
setSelectedTerm(e.currentTarget.value)}
style={{
WebkitAppearance: "none",
border: "none",
MozAppearance: "none",
appearance: "none",
}}
>
Winter 2021
Spring 2021
Summer I 2021
Summer II 2021
Fall 2021

```

From: https://github.com/elonsoc/courseadvysr-web/blob/92ea621d92fdf9680923fe4ed520746b752cd6ed/src/pages/Courses.tsx#L79-L94

In the database, we provide both the term code and title required to make calls for a particular term.

It looks like this:

termcode | title
-- | --
21/01 | Fall 2021
20/01 | Fall 2020
21/02 | Winter 2021
21/04 | Summer I 2021
21/05 | Summer II 2021
21/03 | Spring 2021

To prevent this code smell, an endpoint to query the db for terms is required.