SP-436 / BIS-219 : Improve entity adaptors for validation scripts & SP-434 /...

SP-436 / BIS-219 : Improve entity adaptors for validation scripts & SP-434 / BIS-219: Performance improvements for requesting entities in validation / dynamic properties scripts:
- properties are now lazy loaded
- performance of fetching properties has been improved (over 20 times faster)
- withProperties flag hasn't been introduced as EAGER loading of properties together with samples is slower than loading them lazily in a separate query

SVN: 27909