Add ability to bootstrap new task

[matthewhanson]

Looking for some way (a CLI seems the most obvious) to bootstrap a new task repository. This would include for example:

• standard Python project files
• Skeleton code task.py file
• Skelton Dockerfile

I've been finding a great deal of variations in how various task repos are laid out, so some guidance is needed for sure.

[ping-e84]

Possible new solution: approach this as a documentation issue and leverage AI prompts for building a task

Instead of creating a potentially hard-to-maintain, one-size-fits-all STAC task template, enhance stac-task documentation as follows:

• review existing README.md and generate a suggested AI prompt to build your STAC task scaffolding (e.g. with Copilot, Cursor, etc.)
• add STAC task examples (high-level descriptive docs for various tasks; STAC in-STAC out, image ingest, running Lambda or locally) to be referenced by users and AI tools
• create a set of references for context (e.g. stac-spec, pystac, etc.)
• (eventually) deprecate cirrus_task_example (the present STAC task best practice "template")