docs: Add documentation for AstSPICE module (#37)

Merge pull request #32 from space-ast/dev

feat: add RTTI support for ephemeris and orientation classes

feat: add ObjectManager and object parent scope support

feat: add GUI interface and object edit dialog support

feat: add state type conversion and improve UI state handling

feat: add ClassRegistry and RTTIAPI for object creation

refactor: add header reorganization for AstGUI and AstUtil

refactor: improve STK parser and add Attribute support

refactor: improve UiStateKeplerian and fix quantity parser

refactor: rename parser to load and add binary file support

feat: add Archive serialization framework and refactor RTTI

refactor: reorganize headers and extract serialize test

feat: add UiStateKeplerian class and test

feat: add Propagator base class and improve UI components