CPU usage is misreported.

Currently "0 CPU" means "no CPU metric received in the previous ProfileEvents packet". But there can be many ProfileEvents packets and only a few with CPU increment.

That's why the CPU metric shows something weird like:
```
0
0
0
0
0
1234
0
0
0
...
```

This is unbearable, and the CPU metric should be either fixed or removed altogether.
{
    if (!dst)
    {
        dst = src.cloneEmpty();
    }
    assertBlocksHaveEqualStructure(src, dst, "ProfileEvents");
    std::unordered_map<String, size_t> name_pos;
    for (size_t i = 0; i < dst.columns(); ++i)
        name_pos[dst.getByPosition(i).name] = i;
    size_t dst_rows = dst.rows();
    MutableColumns mutable_columns = dst.mutateColumns();
    auto & dst_column_host_name = typeid_cast<ColumnString &>(*mutable_columns[name_pos["host_name"]]);
    auto & dst_array_current_time = typeid_cast<ColumnUInt32 &>(*mutable_columns[name_pos["current_time"]]).getData();
    // auto & dst_array_thread_id = typeid_cast<ColumnUInt64 &>(*mutable_columns[name_pos["thread_id"]]).getData();
    auto & dst_array_type = typeid_cast<ColumnInt8 &>(*mutable_columns[name_pos["type"]]).getData();
    auto & dst_column_name = typeid_cast<ColumnString &>(*mutable_columns[name_pos["name"]]);
    auto & dst_array_value = typeid_cast<ColumnInt64 &>(*mutable_columns[name_pos["value"]]).getData();
    const auto & src_column_host_name = typeid_cast<const ColumnString &>(*src.getByName("host_name").column);
    const auto & src_array_current_time = typeid_cast<const ColumnUInt32 &>(*src.getByName("current_time").column).getData();
    const auto & src_array_thread_id = typeid_cast<const ColumnUInt64 &>(*src.getByName("thread_id").column).getData();
    const auto & src_column_name = typeid_cast<const ColumnString &>(*src.getByName("name").column);
    const auto & src_array_value = typeid_cast<const ColumnInt64 &>(*src.getByName("value").column).getData();
    struct Id
    {
        StringRef name;
        StringRef host_name;
        bool operator<(const Id & rhs) const