Change ExceptionsStore to allow multiple callbacks

[jander-msft]

Summary

Refactor the ExceptionsStore callback notion in order to allow multiple callbacks and separate the callback behavior from the store implementation. These changes allow future callbacks to be added without having to chain exception store implementations together and to separate the callback concerns from the store concerns.

Overview of Changes

• Introduce IExceptionsStoreCallback and IExceptionsStoreCallbackFactory interfaces; the latter allows breaking circular dependencies between exception stores and callback implementations that would prevent DI composition.
• Refactor ConfiguredExceptionsStore into ExceptionsStoreLimitsCallback and ExceptionsStoreLimitsCallbackFactory.
• Refactor ConfiguredExceptionsStoreTests into ExceptionsStoreTests and ExceptionsStoreLimitsCallbackTests to separate testing concerns between testing the now-only exceptions store implementation and the callback implementation.

Release Notes Entry