[Java] Implement non-sparse tensors

We'd like to be able to round-trip NumPy ndarrays through Java, and create tensors in Java that can be eventually mapped to ndarrays in Python. Having even a basic Tensor implementation, with extension types, as a contrib module would help greatly.

Some prior discussions
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**Reporter**: [David Li](https://issues.apache.org/jira/browse/ARROW-10101) / @lidavidm
#### PRs and other links:
- [GitHub Pull Request apache/arrow#8278](https://github.com/apache/arrow/pull/8278)

_{**Note**: *This issue was originally created as [ARROW-10101](https://issues.apache.org/jira/browse/ARROW-10101). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

首先阅读链接的先前讨论和 Apache Arrow pull request #8278；该 issue 没有指定 Java 文件、测试或入口点。完成的标准是支持能够与 NumPy ndarray 往返转换的非稀疏张量，并且能够在 Java 中创建这些张量，以便之后映射到 Python ndarray。

由索引模型根据 Issue 内容生成。