MongoDB: Improve UX by using ctk load table mongodb://...

[amotl]

About

This patch adjusts the MongoDB adapter added with GH-76 to have the same interface like GH-77, in order to facilitate convenient data transfers from MongoDB.

Synopsis

# Define target to be CrateDB schema=testdrive, table=demo.
export CRATEDB_SQLALCHEMY_URL=crate://crate@localhost:4200/testdrive/demo

# Load data from database=testdrive, collection=demo.
ctk load table mongodb://localhost:27017/testdrive/demo

# Verify data has been transferred.
crash --command "SELECT * FROM testdrive.demo;"

Details

The patch effectively automates the procedure outlined within the previous README on behalf of a mongodb_copy() primitive.

https://github.com/crate-workbench/cratedb-toolkit/blob/c31df22b59c8019245d55b2bf10496818f3a0ecc/cratedb_toolkit/io/mongodb/api.py#L12-L70

Reviewers Note

This PR currently can not be reviewed well, because it has multiple ancestors not merged yet. Other PRs will need to be unstacked first.

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
cratedb_toolkit/io/influxdb.py	100.00% <100.00%> (ø)
cratedb_toolkit/io/mongodb/export.py	56.36% <100.00%> (+29.44%)	⬆️
cratedb_toolkit/io/mongodb/extract.py	93.22% <100.00%> (+20.80%)	⬆️
cratedb_toolkit/io/mongodb/translate.py	93.05% <100.00%> (+31.08%)	⬆️
cratedb_toolkit/io/mongodb/util.py	100.00% <100.00%> (ø)
cratedb_toolkit/model.py	98.11% <100.00%> (+1.33%)	⬆️
cratedb_toolkit/testing/testcontainers/mongodb.py	100.00% <100.00%> (ø)
cratedb_toolkit/testing/testcontainers/util.py	80.00% <100.00%> (+12.07%)	⬆️
cratedb_toolkit/util/cr8.py	100.00% <100.00%> (ø)
cratedb_toolkit/io/mongodb/cli.py	71.69% <80.00%> (+2.60%)	⬆️
... and 4 more

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