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config: extend aboard API with bool returns

aboard:set() now returns false and skips the update if an alert
with the same key and message already exists.

drop, drop_if, clean, add, unset, clear now return a bool indicating
whether a change was made.

Also add namespace:get() to look up an alert by key without accessing
internal fields.

@TarantoolBot document
Title: Public alerts API

Update the following methods:

- `alerts_namespace:add(alert)` - now returns `true`.
- `alerts_namespace:set(key, alert)` - now returns `true` if the alert
  was set, `false` if an alert with the same key and message already
  exists.
- `alerts_namespace:unset(key)` - now returns `true` if the alert was
  discarded, `false` if it didn't exist.
- `alerts_namespace:clear()` - now returns `true` if any alerts were
  discarded, `false` if the namespace was already empty.

New method:

- `alerts_namespace:get(key)` - returns the alert with the given key,
  or `nil` if it doesn't exist.

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