Add support for automatic relation aliases

[ntesic]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#19137

This feature could be totally optional, just to see where is best place to enable/disable option, and put new changes under that condition. Some tests are changed, ones that asserting generated SQL since, this feature produce different queries than before.

[simialbi]

@samdark @ntesic Good idea, but for me the cost is to high for to less benefit

[ntesic]

Seems Oracle require different notation for aliases, with 32 chars limit