[C++] Provide a cross platform helper for definition of library init code

[asfimport]

In a few places we have functionality which must be non-trivially initialized before use, including the compute function and exec node factory registries. Rather than requiring developers to remember to call InitializeUTF8(), it'd be better to provide a way to declare on-load code.

Reporter: Ben Kietzman / @bkietz

Related issues:

• [C++] Provide an initialization and/or compatibility check function (is related to)

PRs and other links:

• GitHub Pull Request #11013

_{Note: This issue was originally created as ARROW-13773. Please see the migration documentation for further details.}

[asfimport]

Alessandro Molina / @amol-:
@pitrou @bkietz Is this one still a thing? Should we merge it or move it to 8.0.0 fur further work?

[asfimport]

Apache Arrow JIRA Bot:
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.

[github-actions]

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