New version: Piccolo v0.5.0

[JuliaRegistrator]

• Registering package: Piccolo
• Repository: https://github.com/kestrelquantum/Piccolo.jl
• Created by: @jack-champagne
• Version: v0.5.0
• Commit: a05ab1dd960f1de2c46ac48f8365d2dfee4b0d7a
• Reviewed by: @jack-champagne
• Reference: harmoniqs/Piccolo.jl@a05ab1d#commitcomment-151784951
• Description: A convenience meta-package for quantum optimal control using Pade Integrator Collocation (Piccolo).
• Release notes:

## Breaking changes

- Take special care on limiting your package's reliance on internal objects in QuantumCollocationCore. These objects are subject to change and only the interface as defined by QuantumCollocation can be treated as a contract by external dependencies and users.
- Note that some utility functions such as computing the fidelity loss after doing a rollout have been renamed for clarity.
- The documentation pages for these packages are all active and published. Reach out to the maintainers with questions if you have any

## Changed

- New architecture for QuantumCollocation (interface) with QuantumCollocationCore (implementation) separated 
- Broken up common utilities and objects into separate package: PiccoloQuantumObjects (which is now reexported)
- Moved some of the plotting logic into PiccoloPlots (with later plans to remove it as a hard dependency for users looking to just run in a headless environment)

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[jack-champagne]

[merge approved]