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feat(context): use a faster UID generator

Replace `uuid/v4` with `hyperid` for auto-generated unique identifiers
used in Context name and Interceptor binding keys.

This change improves the performance of `@loopback/rest` from
handling ~2.4k requests/second to ~3.5k requests/second on average.
The average latency is improved from 3.8ms to 2.6ms.

Signed-off-by: Miroslav Bajtoš <mbajtoss@gmail.com>

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