Add command to write inherited metadata to bottom-level files

[tsalo]

Summary

We should probably create a command that disables the inheritance principle- i.e., takes any metadata or inherited files, like events files or aslcontext files, and writes out their contents at the lower level of the BIDS dataset.

Additional details

Some tools, such as QSIPrep, don't completely support the inheritance principle yet. Plus, datasets curated with CuBIDS may have conflicting metadata. While the inheritance principle supports this, it makes the dataset less readable. For example, if you have task-rest_bold.json at the top level with RepetitionTime = 2, but one of your BOLD files in the dataset, sub-01/ses-01/func/sub-01_ses-01_task-rest_acq-VAR_bold.json, has a TR of 1.5, then a naive user might read the top-level file and assume that the TR for that file is 2.