AMReX-Codes/pyamrex

AI Summary: This enhancement proposes that the `ParmParse` object should be refactored to behave like a standard Python dictionary. It should support both reading and writing of nested values using bracket notation (e.g., `__getitem__` and `__setitem__`). This is a follow-up to a previous issue and is labeled as a 'good first issue'.

AI Summary: This issue proposes enhancing `amrex::ParmParse` by adding new helper functions to import configuration data. Specifically, it aims to allow `ParmParse` to read directly from Python dictionaries, and subsequently from various file formats like YAML, TOML, JSON, and XML by first converting them into Python dictionaries. This would extend the existing `addfile` functionality to support a wider range of input sources.