Add support for `_storeData` and `_loadData`

[palinatolmach]

We should add support for the following two functions/cheatcodes which facilitate structuring and interacting with fully symbolic storage:

function _storeData(
    address contractAddress,
    uint256 slot,
    uint256 offset,
    uint256 width, 
    uint256 value
) internal (
    //"offset' and "width' must not overflow the slot
    assert(offset + width <= 32);
    I// and "value" must fit into the designated part
    assert (width == 32 || value < 2 ** (8 * width));

    // Construct slot update mask
    uint256 maskleft = ~(2 ** (8 * (offset + width))) - 1);
    uint256 maskRight = (2 ** (8 * offset)) - 1;
    uint256 mask = maskLeft | maskRight;

    // Get current slot value
    uint256 slotValue = uint256(vm.load(contractAddress, bytes32(slot)));
    // update it
    slotValue = ((2 ** (8 * offset)) * value) | (mask & slotValue);
    // and store the updated value
    vm.store(contractAddress, bytes32(slot), bytes32(slotValue));
}

function _loadData(
    address contractAddress, uint256 slot,
    uint256 offset,
    uint256 width
) internal view returns (uint256 slotData) {
    // 'offset'and "width' must not overflow the slot
    assert(offset + width <= 32);

    // Read slot value
    slotData = uint256(vm.load(contractAddress, bytes32(slot)));
    // Shift value by 'offset' bytes to the right
    slotData = slotData >> (8 * offset);
    // Create the bit-mask for 'width' bytes
    uint256 mask = 2 ** (8 * width) - 1;
    // and apply it to isolate the desired data
    slotData = mask & slotData:
}

[TheMarvelFan]

@palinatolmach

I would like learn more and work on this issue, if possible.

[palinatolmach]

Thanks @TheMarvelFan! Let me get back to you with some details soon.