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GH-43276: [Go][Parquet] Make DeltaBitPacking Encoders/Decoders Generic (#43279)



### Rationale for this change

Fixes: #43276

The slice of `miniBlockValues` in the decoder was getting reset between calls to `Decode`, while the remaining internal state of the decoder was persisted. By making the decoder generic, it became possible to bring `miniBlockValues` into the base decoder.

The encoder was also made generic for consistency. By avoiding reflection, encoding performance is improved (from around `700 MB/s` before to about `1100 MB/s` after on my machine).

### What changes are included in this PR?

- Passing test case reproducing the reported bug.
- Benchmarks for `DeltaBinaryPacked`
- Refactor of `deltaBitPackDecoder` and `deltaBitPackEncoder` to make them generic.

### Are these changes tested?

Yes

### Are there any user-facing changes?

The DeltaBitPackDecoders should no longer panic when decoding multiple batches from a single page.

* GitHub Issue: #43276

Authored-by: Joel Lubinitsky <joellubi@gmail.com>
Signed-off-by: Joel Lubinitsky <joellubi@gmail.com>