Create a file from metadata only

[ageorgou]

Will address #41.

• [x] New create_from_metadata function on our NwbFile
• [x] New CLI entrypoint metadata2nwb that calls the above
• [x] Basic tests of the new function
• [ ] Can more functionality be shared between create_from_metadata and import_labview_folder?

To be merged after #45.

[codecov-commenter]

Codecov Report

Merging #49 into master will increase coverage by 1.54%. The diff coverage is 82.50%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   52.22%   53.76%   +1.54%     
==========================================
  Files          11       12       +1     
  Lines        1507     1581      +74     
  Branches      247      252       +5     
==========================================
+ Hits          787      850      +63     
- Misses        687      696       +9     
- Partials       33       35       +2     

Impacted Files	Coverage Δ
src/silverlabnwb/script.py	0.00% <0.00%> (ø)
src/silverlabnwb/nwb_file.py	91.99% <81.25%> (-0.19%)	:arrow_down:
src/silverlabnwb/metadata.py	89.04% <100.00%> (+0.63%)	:arrow_up:
tests/test_metadata_import.py	100.00% <100.00%> (ø)

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