Get Dataset: add custom terms of use

[ekraffmiller]

What this PR does / why we need it:

Needed for the Dataset Terms Tab, if custom terms are chosen, these additional fields are displayed.

Which issue(s) this PR closes:

• Closes Get Dataset Extension: add Custom Terms and convert to Markdown #247

Suggestions on how to test this:

Review the code and tests for Get Dataset use case

Is there a release notes update needed for this change?:

Additional documentation:

[g-saracca]

Heey, just some minor comments.
To understand this, we need to format all these terms of use data into markdown to show it in a better way in the Dataset page?
I understand we wont need any change in the frontend repo as the default value of keepRawFields is false.

[ekraffmiller]

Heey, just some minor comments. To understand this, we need to format all these terms of use data into markdown to show it in a better way in the Dataset page? I understand we wont need any change in the frontend repo as the default value of keepRawFields is false.

Good morning, welcome back! Yes, all these fields are text boxes which allow html in the edit form, so they need to be displayed as markdown in the terms tab. In my frontend PR for the terms tab, I'm using the MarkdownComponent to render them.

[ofahimIQSS]

Tests are passing - merging PR