Prepare release 5.0.0

[rokt-releases]

Preparing for release 5.0.0

• Bumped version
• Updated changelog
• Generated test build 5.0.0-alpha.12

[cursor]

PR Summary

Low Risk
Version and changelog-only changes with no application logic or binding modifications.

Overview
Release 5.0.0 — bumps package versions from 4.2.0 to 5.0.0 across mParticle.MAUI, mParticle.Maui.Kits.Rokt, and mParticle.Maui.Kits.Rokt.Payments, updates root VERSION, and finalizes CHANGELOG.md for the 5.0.0 section (dated 2026-07-29) with compare links for [Unreleased] and [5.0.0].

No runtime or binding code changes in this PR; it only aligns versioning and release notes with work already merged for the major release (native SDK upgrades, Rokt kit restructuring, log-level forwarding, etc., as documented under the new changelog entry).

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