RF+BF: Move reporting code to own subpackage, break up big modules

[moloney]

Few fixes/improvements around reporting. In particular stop raising exceptions in the setter for the done propety.

[codecov-commenter]

Codecov Report

Patch coverage: 79.57% and project coverage change: -1.89 ⚠️

Comparison is base (b3f4e4c) 77.71% compared to head (39a9b9a) 75.82%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   77.71%   75.82%   -1.89%     
==========================================
  Files          25       24       -1     
  Lines        6407     5667     -740     
==========================================
- Hits         4979     4297     -682     
+ Misses       1428     1370      -58     

Impacted Files	Coverage Δ
dcm/reports/net_report.py	64.75% <64.75%> (ø)
dcm/reports/xfer_report.py	70.61% <70.61%> (ø)
dcm/store/base.py	70.78% <70.78%> (ø)
dcm/util.py	80.71% <78.94%> (+3.57%)	⬆️
dcm/lazyset.py	83.22% <84.00%> (+38.85%)	⬆️
dcm/router.py	87.54% <87.54%> (ø)
dcm/net.py	91.55% <88.78%> (+8.52%)	⬆️
dcm/cli.py	72.97% <89.28%> (+1.73%)	⬆️
dcm/reports/__init__.py	68.77% <92.68%> (ø)
dcm/node.py	95.83% <95.83%> (ø)
... and 12 more

... and 10 files with indirect coverage changes

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