Search Users (based on name)

Hi,
Is there some way we can search users by name (in workspace) in Person field.

Explanation:
If we have just a name of person and we have a search-bar appearing in the notion-ui. Someway we can add search user functionality in the API. (Search-user-by-name)

something like
```
def get_user_by_name(user_name):
...
return possible_matched_users(User_Obj or User_Id/s)
```


Start with the Person field and the proposed get_user_by_name(user_name) entry point, then inspect how the Python client represents User_Obj and User_Id. Done means the API can search workspace users by name and return the possible matching users or identifiers, with behavior for unmatched or ambiguous names defined.

Written by the indexing model from the issue text.