Changed the isReadWrite parameter to createVolumeDataPageAccessor to be an AccessModeEnum with an AccessMode_Create option so we can handle ProduceStatus better (passing this accessmode changes the produceStatus of the target layer to ProduceStatus_Normal).

Build python bindings optionally (default on)

See merge request osdu/open-vds!4

It's useful to be able to build the core parts of the project without
having to bother with the python runtime, dependencies, and even build
time.

Add build framework for python extension

See merge request osdu/open-vds!3

Implement the minimum required framework to build a pybind11 [1]
generated python extension. The approach is based on various Equinor
projects [2].

The python building relies on high-quality export files, both from
install(EXPORT) and export(TARGETS) for both installed and build-dir
copies of openvds.

In short, the approach is to build the python code with python tooling,
integrated with the root cmake project through a custom target.

[1] https://pybind11.readthedocs.io/en/stable/
[2] https://github.com/equinor/ecl3

Use atomic<int64_t>, not atomic_int64_t

See merge request osdu/open-vds!2

It seems like libstdc++ for gcc<7 does not include the alises for
atomic_intN_t. A reasonable workaround is to use the actual type
directly, instead of the alias.

Set correct number of samples for inline/crossline dimensions. Explicitly call commit() to write back remaining pages at the end.

Implemented createPage in VolumeDataPageAccessor to make it possible to do low-level brick-by-brick writes. Fixed various bugs related to writable pages.

Added createPage()/readPage() methods to VolumeDataPageAccessor interface and re-implemented readPageAtPosition() as an inline method in terms of getChunkIndex() and readPage().

Introduced a persistentID for the SEGYFileInfo. Added new options to the SEGYUpload tool to specify the bucket, region, prefix and persistentID for the uploaded dataset.

Make getUniqueHash() actually unique by seeding the random number generators with a hash of the current time.