[1.x] Add EngineConfig extensions to EnginePlugin (#1387) #1401
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This PR adds an extension point to EngineConfig through EnginePlugin using
a new EngineConfigFactory mechanism. EnginePlugin provides interface methods to
override configurations in EngineConfig. The EngineConfigFactory produces a new
instance of the EngineConfig using these overrides. Defaults are used absent
overridden configurations.
This serves as a mechanism to override Engine configurations (e.g., CodecService,
TranslogConfig) enabling Plugins to have higher fidelity for changing Engine
behavior without having to override the entire Engine (which is only permitted for
a single plugin).