api: add ConnectionObserver to the connection_pool

ConnectionObserver provides an observer semantics for components interested in knowing changes of connections in a ConnectionPool. We have to take into account that user callbacks can take an indefinite amount of time. The simplest solution is to process each connection in a separate goroutine. This should not affect to performance because most of the time these goroutines are blocked. Closes #178
tarantool · Aug 30, 2022 · be96977 · be96977
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -11,6 +11,8 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 ### Added
 
 - Support queue 1.2.0 (#177)
+- ConnectionObserver interface for knowing changes of connections in
+  ConnectionPool (#178)
 
 ### Changed