Enhance all dict type annotations

For each dict that we control properly annotate the type of key and values.

For JSON controlled by others (i.e. returned by API)... it's pretty
hard! For the moment just annotate all of them via a generic `dict[Any,
Any]'.

(We can define a custom JSON type annotation as documented by
<python/typing#182> but we will still have
several problems and at the end we will always return Any.)

All of this was pointed out via `mypy --strict .'.

transferwee.py

@@ -38,7 +38,7 @@
 will be shared via emails or link.
 """
 
-from typing import List, Optional
+from typing import Any, List, Optional, Union
 import binascii
 import functools
 import hashlib
@@ -172,7 +172,7 @@ def download(url: str, file: str = "") -> None:
             f.write(chunk)
 
 
-def _file_name_and_size(file: str) -> dict:
+def _file_name_and_size(file: str) -> dict[str, Union[int, str]]:
     """Given a file, prepare the "item_type", "name" and "size" dictionary.
 
     Return a dictionary with "item_type", "name" and "size" keys.
@@ -223,7 +223,7 @@ def _prepare_email_upload(
     sender: str,
     recipients: List[str],
     session: requests.Session,
-) -> dict:
+) -> dict[Any, Any]:
     """Given a list of filenames, message a sender and recipients prepare for
     the email upload.
 
@@ -242,7 +242,9 @@ def _prepare_email_upload(
     return r.json()
 
 
-def _verify_email_upload(transfer_id: str, session: requests.Session) -> dict:
+def _verify_email_upload(
+    transfer_id: str, session: requests.Session
+) -> dict[Any, Any]:
     """Given a transfer_id, read the code from standard input.
 
     Return the parsed JSON response.
@@ -265,7 +267,7 @@ def _prepare_link_upload(
     display_name: str,
     message: str,
     session: requests.Session,
-) -> dict:
+) -> dict[Any, Any]:
     """Given a list of filenames and a message prepare for the link upload.
 
     Return the parsed JSON response.
@@ -281,7 +283,9 @@ def _prepare_link_upload(
     return r.json()
 
 
-def _storm_preflight_item(file: str) -> dict:
+def _storm_preflight_item(
+    file: str,
+) -> dict[str, Union[List[dict[str, int]], str]]:
     """Given a file, prepare the item block dictionary.
 
     Return a dictionary with "blocks", "item_type" and "path" keys.
@@ -296,7 +300,9 @@ def _storm_preflight_item(file: str) -> dict:
     }
 
 
-def _storm_preflight(authorization: str, filenames: List[str]) -> dict:
+def _storm_preflight(
+    authorization: str, filenames: List[str]
+) -> dict[Any, Any]:
     """Given an Authorization token and filenames do preflight for upload.
 
     Return the parsed JSON response.
@@ -335,7 +341,7 @@ def _md5(file: str) -> str:
     return h.hexdigest()
 
 
-def _storm_prepare_item(file: str) -> dict:
+def _storm_prepare_item(file: str) -> dict[str, Union[int, str]]:
     """Given a file, prepare the block for blocks dictionary.
 
     Return a dictionary with "content_length" and "content_md5_hex" keys.
@@ -345,7 +351,7 @@ def _storm_prepare_item(file: str) -> dict:
     return {"content_length": filesize, "content_md5_hex": _md5(file)}
 
 
-def _storm_prepare(authorization: str, filenames: List[str]) -> dict:
+def _storm_prepare(authorization: str, filenames: List[str]) -> dict[Any, Any]:
     """Given an Authorization token and filenames prepare for block uploads.
 
     Return the parsed JSON response.
@@ -373,7 +379,9 @@ def _storm_prepare(authorization: str, filenames: List[str]) -> dict:
     return r.json()
 
 
-def _storm_finalize_item(file: str, block_id: str) -> dict:
+def _storm_finalize_item(
+    file: str, block_id: str
+) -> dict[str, Union[List[str], str]]:
     """Given a file and block_id prepare the item block dictionary.
 
     Return a dictionary with "block_ids", "item_type" and "path" keys.
@@ -396,7 +404,7 @@ def _storm_finalize_item(file: str, block_id: str) -> dict:
 
 def _storm_finalize(
     authorization: str, filenames: List[str], block_ids: List[str]
-) -> dict:
+) -> dict[Any, Any]:
     """Given an Authorization token, filenames and block ids finalize upload.
 
     Return the parsed JSON response.
@@ -469,7 +477,9 @@ def _storm_upload(url: str, file: str) -> None:
         )
 
 
-def _finalize_upload(transfer_id: str, session: requests.Session) -> dict:
+def _finalize_upload(
+    transfer_id: str, session: requests.Session
+) -> dict[Any, Any]:
     """Given a transfer_id finalize the upload.
 
     Return the parsed JSON response.