[C++][Python] Register Multiple Kernels for a UDF

[asfimport]

The current UDF integration (https://issues.apache.org/jira/browse/ARROW-15639) doesn't support multiple kernel registration. It only supports registering a single kernel under a given function name. Enabling multiple kernels to be registered under the same function name is a must for usability and consistency with the existing functions in the function registry. 

Reporter: Vibhatha Lakmal Abeykoon / @vibhatha
Assignee: Vibhatha Lakmal Abeykoon / @vibhatha

PRs and other links:

• GitHub Pull Request #14320

_{Note: This issue was originally created as ARROW-16212. Please see the migration documentation for further details.}

[asfimport]

Todd Farmer / @toddfarmer:
This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned per project policy. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

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Vibhatha Lakmal Abeykoon / @vibhatha:
Restarting the work on this ticket.

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A. Coady / @coady:
Is any support for type aliases planned? It can be tedious to list every precision and resolution for a function that supports most types.

[asfimport]

Vibhatha Lakmal Abeykoon / @vibhatha:
I see your point. This PR is still under review, once we move forward we will consider about such features.

cc @westonpace  

[asfimport]

Vibhatha Lakmal Abeykoon / @vibhatha:
For some reason the Jira is not picking up the PR.

cc @westonpace  

[asfimport]

Weston Pace / @westonpace:
Sorry for the delay in reviewing. I put in a review now. @coady, do you feel @vibhatha's change in the PR (being able to specify a list of supported types) would address your needs?

[asfimport]

A. Coady / @coady:

@coady, do you feel @vibhatha's change in the PR (being able to specify a list of supported types) would address your needs?
Yeah, thanks, I think that's fine for the initial implementation.

Just something to keep in mind for future user-friendliness. It could be as simple as providing some pre-defined lists: all the int types, all the float types, etc.