Update DatasetMetadata and ReadMe

[gchhablani]

This PR contains the changes discussed in #2395.

Edit:
In addition to those changes, I'll be updating the ReadMe as follows:

Currently, Section has separate parsing and validation error lists. In .validate(), we add these lists to the final lists and throw errors.

One way to make ReadMe consistent with DatasetMetadata and add a separate .validate() method is to throw separate parsing and validation errors.

This way, we don't have to throw validation errors, but only parsing errors in __init__ (). We can have an option in __init__() to suppress parsing errors so that an object is created for validation. Doing this will allow the user to get all the errors in one go.

In test_dataset_cards , we are already catching error messages and appending to a list. This can be done for ReadMe() for parsing errors, and ReadMe(...,suppress_errors=True); readme.validate() for validation, separately.

Edit 2:
The only parsing issue we have as of now is multiple headings at the same level with the same name. I assume this will happen very rarely, but it is still better to throw an error than silently pick one of them. It should be okay to separate it this way.

Wdyt @lhoestq ?

[lhoestq]

Thank you !
Could you rename pretty_names to pretty_name ?
Other than that it looks all good to me :)

[lhoestq]

Thanks a lot ! Merging ^^