Config diff adjustments

[steiler]

• Change the EntryVisitor used in the sharedEntryAttributes.Walk() from a funtion to an interface, which allows for the EntryVisitor to keep state.
• Introduce validation statistics indication how many of the different validation types where executed

[hansthienpondt]

LGTM

[codecov]

Codecov Report

❌ Patch coverage is 58.08824% with 57 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/tree/types/validation_stats.go	28.88%	32 Missing ⚠️
pkg/tree/types/update_insert_flags.go	0.00%	11 Missing ⚠️
pkg/tree/sharedEntryAttributes.go	80.43%	9 Missing ⚠️
pkg/datastore/transaction_rpc.go	0.00%	5 Missing ⚠️

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