**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.
bool isInjective(const ColumnsWithTypeAndName &) const override { return true; }
    DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
    {
        if (!checkAndGetDataType<DataTypeUInt32>(arguments[0].get()))
            throw Exception("Illegal type " + arguments[0]->getName() +
                            " of argument of function " + getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
        return std::make_shared<DataTypeFixedString>(16);
    }
    bool useDefaultImplementationForConstants() const override { return true; }
    ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t ) const override
    {
        const auto & col_type_name = arguments[0];
        const ColumnPtr & column = col_type_name.column;
        if (const auto * col_in = typeid_cast<const ColumnUInt32 *>(column.get()))
        {
            auto col_res = ColumnFixedString::create(IPV6_BINARY_LENGTH);
            auto & vec_res = col_res->getChars();
            vec_res.resize(col_in->size() * IPV6_BINARY_LENGTH);
            const auto & vec_in = col_in->getData();
            for (size_t out_offset = 0, i = 0; out_offset < vec_res.size(); out_offset += IPV6_BINARY_LENGTH, ++i)
                mapIPv4ToIPv6(vec_in[i], &vec_res[out_offset]);
            return col_res;
        }
        else
            throw Exception("Illegal column " + arguments[0].column->getName()
                + " of argument of function " + getName(),
                ErrorCodes::ILLEGAL_COLUMN);
    }
private:
    static void mapIPv4ToIPv6(UInt32 in, UInt8 * buf)