isSplitText
Determines whether a list of CardComponent instances represents a "split text" layout.
A "split text" layout is defined as a list containing exactly three elements:
A CardComponent.Text at index
0A CardComponent.Spacer at index
1A CardComponent.Text at index
2
If the list is null, the function returns false.
Receiver
A nullable list of CardComponent instances.
Return
true if the list matches the split text structure, otherwise false.