Zodipy

**Note: This release only refactored code implementation and restructured files**

- Moved logic for selecting simulation strategy out of the `Zodi` initialization to its own file `_integration.py` ac84be61102078b96876f1f7c5037a48f6eaa236

- Implemented manual step-wise integration to drastically improve memory consumption for high nsides 8c510111494a72a7b8f4f929a286a3d6a5ef5b9a
- Renamed some files
- Added more type hints

**Note: This release only refactored code implementation and restructured files**

- Renamed files d1cd49cb21fe63ac17a32dbfe8e655c163f6e60f.
- Fixed bug where the angle theta for the earth-trailing component was not properly constrained deb3e3cca121e9816959acd721f3fb0cb9f03f84.

**Note: This release only refactored the code implementation**
- Implemented the factory method pattern into various aspects of the code d5703dd05f871ea95cc4be07f9e8bcf7ee92d213 943dd148531767b7b3d79455f88485648a51dc4e

- Changed `Zodi` input arguments (`start`, `stop`, and `step` -> `epochs`) and removed `solar_cut` keyword 77f9912c2051edda368222022ede960f95b78dad.
- Added possibility to include hit maps to produce pixel weighted average simulations and refactored the SimulationStrategy classes b84e250a8fac0a36c640d0a4f06083758e8dd956 2f95b3f59d73639ce4b893b5daed8c67048da234.

- Refactored code, updated documentation, and changed keyword name in `get_emission` from `mask` -> `solar_cut` 44b7ab01326ecb2c928c6d643a871e6831372e08 95da02d93d807d28d8ffb64468ffc11be3a5c904.