Integrate MontePy as a backend parser for openmc_mcnp_adapter

[MicahGale]

Currently there is a tool to convert MCNP models to OpenMC develop by Paul Romano: openmc_mcnp_adapter. It is a relatively robust and fast tool for accomplishing this task.

However there's a few roles that MontePy might be able to do more effectively if implemented as the MCNP parser:

1. More robust support for more edge cases.
2. Support for more types of MCNP inputs.
3. Growing support as MontePy has features added.

However, there is one main downside to this. Performance. One of the main users of this tool works with models that are O(1e6) lines long. Currently MontePy could take up to an hour to open a file of this size possibly.