fix: zero ltv transfer

[sakulstra]

• fix: disallow enabling 0ltv asset as collateral
  • currently it is possible to enable collateral for a 0 ltv asset, which seems intended as 0ltv is mostly used for mitigation when a asset depegs to no longer allow borrows. By allowing to enable collateral, potentially a user could "up" his position with a 0ltv asset to force liquidators to liquidate 0ltv.
• fix: don't automatically activate collateral for assets received in isolation
  • currently when receiving an isolated asset (via supply or transfer) it would be automatically enabled as collateral, which seems unintended
• feat: add new ISOLATED_COLLATERAL_SUPPLIER role
  • in order to allow supply as collateral for certain contracts (e.g. migration tool) a new role is added, allowing supplies and transfers with the old behavior.

[height]

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[miguelmtzinf]

This PR looks good to me. The only thing that I do not like is the need of passing the addressesProvider, which increases gas costs. I realized we can skip that by fetching the address from the AToken. Think it's worth to evaluate that option @sakulstra
(created PR #836 with the code, couldn't PR to your branch directly)