Manually specify a filepath upon init

Here we see how nbproject prints a metadata header for a notebook that has been initialized.

from nbproject import header

header(filepath="example-after-init-set-filename.ipynb")
idKLqggebgs7Tq
version0
time_init2022-04-18 22:07
time_run2024-05-20 09:45
pypackagenbproject==0.10.3
from nbproject import meta
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assert meta.store.id == "KLqggebgs7Tq"
assert hasattr(meta.store, "time_init")