Data loading: Refactor to use more OO. Add examples/cloud_import.py.

[amotl]

• Data loading: Refactor to use more OO.
• Data model, naming things, error handling, croud workarounds.
• Add examples/cloud_import.py.

[codecov]

Codecov Report

Attention: 68 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
cratedb_toolkit/cluster/cli.py	73.91% <100.00%> (ø)
cratedb_toolkit/exception.py	100.00% <100.00%> (+100.00%)	⬆️
cratedb_toolkit/model.py	77.41% <83.33%> (-20.70%)	⬇️
cratedb_toolkit/retention/store.py	25.17% <0.00%> (-69.72%)	⬇️
cratedb_toolkit/api/guide.py	50.00% <50.00%> (ø)
cratedb_toolkit/util/croud.py	31.86% <37.50%> (-37.10%)	⬇️
cratedb_toolkit/io/cli.py	83.72% <61.11%> (-0.28%)	⬇️
cratedb_toolkit/io/croud.py	17.89% <22.22%> (-67.22%)	⬇️
cratedb_toolkit/api/main.py	51.42% <51.42%> (ø)

... and 17 files with indirect coverage changes

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