User opt-in for the readonly kludge. This commit is just a preparation to make the next one easier to diff.

Ad-hoc test for reproducing bug 671969.

See merge request !91

Major overhaul of build pipelines.

See merge request !90

Additional telemetry

See merge request !88

Add logging close to the public read() and write() when OPENZGY_VERBOSE >=2. Lower level logging often see regions already broken into bricks.

In the periodic output of the performance logger, include a timestamp and the average latency for this period.

Logging to file, etc.

See merge request !87

Use a single logger for each reader and writer. Except cloud related messages which still use a global logger.

Sync with in-house changes

See merge request !86

Temporarily disable the api.alturl test because the feature now requires a read-only dataset and OpenZGY doesn't make those yet.

Make --no-exec the default for tests because the Azure SDK requires it. This simplifies testing on Windows.

Improved error messages

See merge request !85

Improved error messages. SDAPI exceptions are now mostly wrapped in a ZgyError exception, allowing OpenZGY to substitute a more readable message in the (regrettably few) cases it can do so.