Feat: Added LiquidationDataProvider contract (#148)

* Added LiquidationDataProvider contract

* Minor changes from comments in PR

* Minor changes from comments in PR 2

* Added one more function to the LiquidationDataProvider contract + fixed one bug in the _isReserveReadyForLiquidations function

* Added the LiquidationDataProvider contract to deployment scripts

* Replaced the LiquidationHelper library with the LiquidationDataProvider contract in the PoolLiquidationTests test

* fix: refactor tests where possible

* fix: add tests

* fix: add tests

* Removed the _getReserveFullInfo function from the LiquidationDataProvider contract

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Co-authored-by: Lukas <[email protected]>

Author: TepNik