Instrument the Change Detection

[vicb]

It would be great to be able to get some information out of a CD run:

• total number of records,
• number of checked records,
• number of changed records,
• number of change components.

This information could be used for tests as described in #1146

/cc @vsavkin @yjbanov @matanlurey @mhevery

[matanlurey]

+1. The same would be useful for view creation/hydration

[vicb]

dup of #392

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