strongloop / loopback-next / 9120

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feat(context): tidy up context for resolving injections of a singleton binding

- We now use owner context of the current binding to resolve injections if
the current binding scope is `SINGLETON`. This change makes sure a singleton
binding won't have dependencies outside of the owner context chain. It fixes
the root cause of https://github.com/strongloop/loopback-next/issues/2495.
- add more tests for controller route
- add a diagram and table to explain how binding scopes impact resolution

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