sgerrand / ex_deputy / 26497017362

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feat(telemetry): emit [:deputy, :request, :exception] on raise/throw/exit

`Deputy.HTTPClient.Req.request/1` previously dropped raises, throws and
exits from the underlying adapter on the floor: the `:stop` event never
fired and no `:exception` event was emitted, leaving instrumentation
blind to crash paths.

Wrap the request in a try/rescue/catch block that emits a new
`[:deputy, :request, :exception]` event with `duration`, `method`,
`url`, `kind`, `reason` and `stacktrace`, then re-raises the original
failure so callers still see it. The `:stop` event is suppressed for
the same request to avoid double-counting.

Document the event shape in `Deputy`'s moduledoc and cover both
exception and throw paths in tests.

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