Implement concat_elements_dyn kernel

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
The idea is to add kernels to support concatenating arrays element wise, such as concat_elements_utf8 where arrays like

┌──────┐ ┌──────┐             ┌──────┐
│ foo  │ │ aaa  │             │fooaaa│
├──────┤ ├──────┤  ────────▶  ├──────┤
│<null>│ │ bbb  │             │<null>│
├──────┤ ├──────┤             ├──────┤
│ baz  │ │ ccc  │             │bazccc│
└──────┘ └──────┘             └──────┘

Describe the solution you'd like
I would like a function like:

fn concat_elements_dyn(left: &dyn Array, right: &dyn Array) -> ArrayRef {
}

That dispatches on type of arrays:

1. If the types are different, it will return an error
2. if the types are DataType::Utf8 it will invoke concat_elements_utf8

It would also be awesome to add support for other data types such as DataType::LargeUtf8, DataType::Binary, and DataType::LargeBinary

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
See #1747 and the original PR #1720 from @Ismail-Maj

[ismailmaj]

Might as well continue :D Can I get assigned please?

[alamb]

Done!

[Weijun-H]

Hi there, is this feature done? If not, I want to pick it up.

[alamb]

Hi @Weijun-H -- thanks!

I do not think it is done yet
https://docs.rs/arrow/33.0.0/arrow/compute/kernels/concat_elements/index.html