GH-50735: [Documentation] List run-end compute functions

[Whning0513]

Addresses #50735.

List the existing C++ run_end_encode and run_end_decode compute functions in the Structural transforms table, including their input/output shapes and the encode options class.

• GitHub Issue: [Docs][Doc][C++] run-end-encoding functions not listed in compute functions #50735

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[github-actions]

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[Reranko05]

Thanks for contributing! Could you follow Arrow's PR title format GH-<Issue Number>: <[Component] Title> and then you can mark the issue as "Ready to Review".

[github-actions]

⚠️ GitHub issue #50735 has been automatically assigned in GitHub to PR creator.