Add interfaces for installation library#51184

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dsplaisted wants to merge 5 commits intodotnet:dnupfrom

dsplaisted:installer-library

Commits on Oct 8, 2025

Commits on Oct 9, 2025

Flesh out installer interfaces
dsplaisted
committed

Commits on Oct 10, 2025

Update install root, install discoverer, and install type APIs
dsplaisted
committed