arrow

GH-33856: [C#] Implement C Data Interface for C# (#35496)

### Rationale for this change

This continues implementing the C Data Interface for C# with integration for `ArrowArray`, `RecordBatch` and streams.

### What changes are included in this PR?

- Adds classes `CArrowArray` and `CArrowStream` to represent the C API structures.
- Adds interface `IArrowArrayStream` to represent an array stream or record batch reader.
- Adds classes `CArrowArrayImporter`, `CArrowArrayExporter`, `CArrowArrayStreamImporter` and `CArrowArrayExporter` to marshal between C# and C representations.
- Augments the native memory representation to support (reasonably safe) ownership of memory by external code.

### Are these changes tested?

Yes. Testing is largely done via the Python C API interface.

### Are there any user-facing changes?

Yes, this adds new user-facing APIs to import and export C# structures using the C API.

**This PR includes breaking changes to public APIs.**

The default time unit for Time64Type was previously milliseconds. This does not appear to be valid, so it has been changed to nanoseconds.

- Closes: #33856
- Closes: #33857
* Closes: #33856

Authored-by: Curt Hagenlocher <curt@hagenlocher.org>
Signed-off-by: Eric Erhardt <eric.erhardt@microsoft.com>