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GH-35809: [C#] Improvements to the C Data Interface (#35810)

### Rationale for this change

This PR fixes issues identified while reading the code of the `Apache.Arrow.C` namespace.

### What changes are included in this PR?

See each commit message for more details.

### Are these changes tested?

Using the existing test suite.

### Are there any user-facing changes?

No.
* Closes: #35809

Authored-by: Theodore Tsirpanis <teo@tsirpanis.gr>
Signed-off-by: Weston Pace <weston.pace@gmail.com>