docs(proposals): global hook for build-system dependency post-processing

[vshawrh]

Summary

Adds a proposal document for extending fromager.hooks with a get_build_system_dependencies global hook point, allowing downstream projects to post-process build-system dependencies for all packages without per-package plugins.

The implementation is in a separate PR: #1271

Related issue: #1263

• PR follows CONTRIBUTING.md guidelines

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Reviewing files that changed from the base of the PR and between d249228 and 8c0b285.

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• docs/proposals/global-build-system-dependencies-hook.md

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