Introduce on_create_child_context hook for creating non root contexts#67

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unleashed wants to merge 3 commits intoproxy-wasm:mainfrom 3scale:on-create-child-context

+44-104

Commits on Dec 23, 2020

dispatcher: add on_create_child_context for a simpler way to create contexts
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examples: use on_create_child_context to create non http or stream contexts
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dispatcher: make on_create_child_context the sole way to create non root ctxts
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