[draft] Null mode at query time

[gortiz]

This PR is an attempt to implement an alternative implementation to correctly support null in V2. Changes were build on top of #11824, but NullValueIndexType was reverted to what we have in master

Semantic table:

nullMode	Segment has null vector	FieldSpec*	in master	in PR
none	N/A	N/A	not null	not null
all	false	N/A	not null	not null
all	true	N/A	null	null
column	false	N/A	N/A	null
column	true	false (default)	N/A	not null
column	true	true	N/A	null

It is to be defined how to change nullMode. At this time what I choose was:

• If useColumnNullability query option is true, then use column nullMode
• else if enableNullHandling query option is true, then use all nullMode
• else use none null mode

[gortiz]

Tests haven't been modified