UniswapAdapter

adapter for uniswap contracts

Here is an adapter for UniswapV2Router02

Its implements functions:

1. getPair

2. createPair

3. allPairsLength

4. addLiquidity

5. removeLiquidity

6. swapExactTokensForTokens

7. swapTokensForExactTokens

8. getAmountsOut

9. getAmountsIn

Also for testings was made wraped ethereum token (WETH) based on IERC20

Tests was done on fork of eth-mainnet, blockNumber: 12883802.