Add Convenience Functions and Example Notebook for Common Operations

[notthatbreezy]

We should have convenience functions and documentation around creating, deleting, listing, getting the following objects:

• datasources
• projects
• scenes
• analyses
• templates

The result of this work should be an example notebook that does the following:

• Creates a COG Scene from some publicly available imagery
• Creates a project with scene
• GETs a template
• Create's an analysis