Optimize uuid generator in ExchangeImpl.java

ExchangeImpl is using the standard uuid generator.

public ExchangeImpl(Pattern pattern) {

        this.id = UUID.randomUUID().toString();

        this.status = Status.Active;

        this.role = Role.Consumer;

        this.pattern = pattern;

    }

This is suboptimal, due to inherent locking/synchronization limitations with the default impl. This enhancement is to switch to a more optimized version.

Similar issue was discussed in CAMEL-3139.