[FEAT-API/UI]: Create Structure Inventory Page

[martyheynbah]

• Create backend for structure inventory
  • create structure_inventory table
    • what are the all of the columns needed? just id and shape? maybe having an example gpgk would help
    • create table to handle anticipated columns that might not be needed for MVP
  • create handler to upload gpgk (POST) and save data to table
  • create handler to get gpgk (GET) and display it on the UI
• Create simple UI for a user to upload a gpgk and then display data