implement programmatic default providers based on context in the engine and Go #16204
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This PR takes an alternative approach for implementing programmatic default providers, that was suggested in the internal design doc.
Instead of making the default provider global, we create an API with a callback that creates a new subcontext. In that subcontext and only in that subcontext is the provider set as the default provider. We achieve this by setting up a new monitor with a different port, so the engine can distinguish between the contexts.
/xref #2059
Fixes #16169
Fixes #16163
Checklist
make tidy
to update any new dependenciesmake lint
to verify my code passes the lint checkgofumpt
make changelog
and committed thechangelog/pending/<file>
documenting my change