d3viz writer

[cmungall]

• Adding d3viz json tree export
• Adding ability to output d3viz json.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.47945% with 53 lines in your changes are missing coverage. Please review.

Project coverage is 76.34%. Comparing base (15bf85c) to head (3ba8d61).

Files	Patch %	Lines
src/oaklib/cli.py	67.85%	18 Missing ⚠️
src/oaklib/transformers/sep_transformer.py	89.24%	10 Missing ⚠️
src/oaklib/transformers/graph_transformer.py	60.00%	8 Missing ⚠️
src/oaklib/transformers/edge_filter_transformer.py	85.36%	6 Missing ⚠️
src/oaklib/transformers/transformers_factory.py	87.87%	4 Missing ⚠️
src/oaklib/utilities/obograph_utils.py	94.44%	4 Missing ⚠️
...oaklib/implementations/sqldb/sql_implementation.py	80.00%	1 Missing ⚠️
src/oaklib/transformers/ontology_transformer.py	85.71%	1 Missing ⚠️
tests/test_cli.py	96.42%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #700      +/-   ##
==========================================
+ Coverage   76.22%   76.34%   +0.11%     
==========================================
  Files         256      261       +5     
  Lines       29801    30132     +331     
==========================================
+ Hits        22717    23004     +287     
- Misses       7084     7128      +44     

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