InfluxDB: Add adapter to influxio, implementing ctk load table influxdb2://...

[amotl]

About

This patch adds an adapter to the influxio package, to facilitate data transfers from InfluxDB v2 and InfluxDB line protocol.

Synopsis

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

# Load data from organization=example, token=token, bucket=testdrive, measurement=demo.
ctk load table influxdb2://example:token@localhost:8086/testdrive/demo

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

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
cratedb_toolkit/io/influxdb.py	100.00% <100.00%> (ø)
cratedb_toolkit/testing/testcontainers/cratedb.py	100.00% <100.00%> (ø)
...ratedb_toolkit/testing/testcontainers/influxdb2.py	100.00% <100.00%> (ø)
cratedb_toolkit/util/database.py	93.06% <100.00%> (+0.28%)	⬆️
cratedb_toolkit/io/cli.py	86.15% <84.21%> (-1.61%)	⬇️

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