**Use case**

Viewing binary data such as bitmasks, hashes, internal representation of IEEE-754 numbers, etc.
Mostly for debugging.

**Describe the solution you'd like**

Similar to `hex`/`unhex`.

`bin` - returns a string with `0` and `1`. Bits are in "human" order, most significant first. Most significant zero bits are not printed (except the case with single zero).

**Describe alternatives you've considered**

Now I have to run interactive `python` from command line, but I will be more happy using ClickHouse.

**Caveats**

The name `bin` may suggest that the function will "split data into bins" but it is completely unrelated.
{
public:
    static constexpr auto name = "IPv4StringToNum";
    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIPv4StringToNum>(); }
    String getName() const override
    {
        return name;
    }
    size_t getNumberOfArguments() const override { return 1; }
    DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
    {
        if (!isString(arguments[0]))
            throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName(),
            ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
        return std::make_shared<DataTypeUInt32>();
    }
    static inline UInt32 parseIPv4(const char * pos)
    {
        UInt32 result = 0;
        DB::parseIPv4(pos, reinterpret_cast<unsigned char*>(&result));
        return result;
    }
    bool useDefaultImplementationForConstants() const override { return true; }
    ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t ) const override