Add endpoint to create additional Entity lists on a project

[spwoodcock]

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation
• 🧑‍💻 Refactor
• ✅ Test
• 🤖 Build or CI
• ❓ Other (please specify)

Related Issue

Related to #1653

Describe this PR

• Adds an endpoint: /projects/{project_id}/additional-entity
• The endpoint takes a single GeoJSON file for param geojson.
• The filename is used as the Entity list name, so ensure the user knows this.
• The endpoint should be called after task areas are created, but before the /generate-project-files endpoint is called during project creation.
• It can be called as many times as needed for the number of additional Entity lists required.

Screenshots

Review Guide

An example GeoJSON in Kathmandu to test with:
roads.geojson.txt

Checklist before requesting a review

• 📖 Read the FMTM Contributing Guide: https://github.com/hotosm/fmtm/blob/main/CONTRIBUTING.md
• 📖 Read the HOT Code of Conduct: https://docs.hotosm.org/code-of-conduct
• 👷‍♀️ Create small PRs. In most cases, this will be possible.
• ✅ Provide tests for your changes.
• 📝 Use descriptive commit messages.
• 📗 Update any related documentation and include any relevant screenshots.

[optional] What gif best describes this PR or how it makes you feel?

[spwoodcock]

Merging this early to get it to staging for testing ASAP

[Sujanadh]

wow loved this PR, so many changes with proper structuring 👍