http-client: move over http-client package

[andrewedstrom]

Description

The http-client package previously lived in https://github.com/Docmaps-Project/ts-api-server/, but that repo is going to be deprecated.

This PR adds it to the monorepo.

Related Issues

• https://github.com/Docmaps-Project/docmaps/issues/126

Checklist

• [ ] I have tested these changes locally and they work as expected.
• [ ] I have added or updated tests to cover any new functionality or bug fixes.
• [ ] I have updated the documentation to reflect any changes or additions to the project.
• [X] I have followed the project's code of conduct and conventions for commit messages.

Additional Information

Note: there aren't any tests for this module. The tests all live within the ts-api-server runtime package. Once we add the runtime package, this code will be tested again.