feat(core): add subpackage for external scripts

[damienwebdev]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/graycoreio/daffodil/blob/develop/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

We currently have code for Authorize.net that's not very extensible or friendly. . I needed a similar bit of code to load some other external javascript dynamically and I wanted to abstract the core of this behavior.

Fixes: N/A

What is the new behavior?

This adds a new subpackage for loading third-party javascript dynamically in a document. This will likely be useful when interacting with third-party widgets and payment APIs.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[griest024]

just one missing doc but otherwise lgtm