ENH: Option to store dataset creation/modification times with `to_hdf`.
#### Is your feature request related to a problem?

"I wish I could use pandas to" store a `DataFrame` with `to_hdf` and optionally include the datetime of dataset creation/modification.

#### Describe the solution you'd like

`DataFrame.to_hdf` should have an option that will store the datetime of dataset creation/modification.

[docstring addition]
```
with_datetime : bool, default False
    Stores `datetime` when dataset is written
```
#### API breaking implications

Shouldn't break anything.

#### Describe alternatives you've considered

A separate "metafile" that the user would need to write with dataset creation/modification datetimes.

#### Additional context

With the possibility of rewriting datasets, having the creation and modification times of the dataset in the HDF5 file would help to inform HDF5 file readers/users of updated datasets.

```python
my_df.to_pdf(..., with_datetime=True, ...)
...
my_df_read = pd.read_hdf(store_file, key=key_value, mode="r")
print(my_df_read.ctime) # None or datetime
print(my_df_read.mtime) # None or datetime
...
my_df_read.info() # Would also show datetimes if present
```
