Track staged uploads

[ceesem]

Improve staged annotations to a) track when an annotation is uploaded and b) batch annotation uploads to fit within the single-transaction limit. Subsequent attempts to upload only apply on un-uploaded roads if, e.g. there is an error somewhere.

[codecov]

Codecov Report

❌ Patch coverage is 96.68246% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
caveclient/annotationengine.py	79.31%	6 Missing ⚠️
caveclient/tools/stage.py	98.41%	1 Missing ⚠️

Files with missing lines	Coverage Δ
tests/test_annotation.py	100.00% <100.00%> (ø)
tests/test_stage.py	100.00% <100.00%> (ø)
caveclient/tools/stage.py	83.15% <98.41%> (+10.04%)	⬆️
caveclient/annotationengine.py	53.06% <79.31%> (+3.06%)	⬆️

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[bdpedigo]

haven't had a chance to actually test this myself but otherwise, looks awesome to me!