[Python][Dataset] Allow enabling I/O coalescing/pre-buffer for IPC in Python

[asfimport]

The option exists in C++ but not Python. The IPC benchmark will need updating too.

Reporter: David Li / @lidavidm
Assignee: David Li / @lidavidm

PRs and other links:

• GitHub Pull Request #10376

_{Note: This issue was originally created as ARROW-12834. Please see the migration documentation for further details.}

[asfimport]

David Li / @lidavidm:
It turns out to not be very helpful, so there's no point in doing the work. If a use case arises we can revisit it.