fix(avl): add missing checks in avl package

[Davphla]

Fix: #4440 (already closed)

This follows notJoon comment : The three issues you pointed out can be resolved with proper bounds checking alone, without requiring separate type changes. In particular, it would be good to add guard for GetByIndex and TraverseByOffset methods. from #4440 (comment)

As well I added a check on pager GetPageWithSize, as it can trigger a division by zero / undefined behavior.

I verified and there shouldn't be any other needed checks in avl packages.

[Gno2D2]

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[Villaquiranm]

nitpick: I think it is better you can have this change reverted to avoid reviewing uneccessary changes

[Villaquiranm]

Same here
nitpick: I think it is better you can have this change reverted to avoid reviewing uneccessary changes

[Davphla]

This condition is not return first, therefore it is hard to read and should be change (As I've done in #4889). If not done in this PR, it should be done in another.