Deltachat

Changes
- use transaction in `Contact::add_or_lookup()` 4059
- Organize the connection pool as a stack rather than a queue to ensure that
connection page cache is reused more often.
This speeds up tests by 28%, real usage will have lower speedup. 4065
- Use transaction in `update_blocked_mailinglist_contacts`. 4058
- Remove `Sql.get_conn()` interface in favor of `.call()` and `.transaction()`. 4055
- Updated provider database.
- Disable DKIM-Checks again 4076
- Switch from "X.Y.Z" and "py-X.Y.Z" to "vX.Y.Z" tags. 4089
- mimeparser: handle headers from the signed part of unencrypted signed message 4013

Fixes
- Start SQL transactions with IMMEDIATE behaviour rather than default DEFERRED one. 4063
- Fix a problem with Gmail where (auto-)deleted messages would get archived instead of deleted.
Move them to the Trash folder for Gmail which auto-deletes trashed messages in 30 days 3972
- Clear config cache after backup import. This bug sometimes resulted in the import to seemingly work at first. 4067
- Update timestamps in `param` columns with transactions. 4083

API-Changes

Changes
- deltachat-rpc-client: use `dataclass` for `Account`, `Chat`, `Contact` and `Message` 4042

Fixes
- deltachat-rpc-server: do not block stdin while processing the request. 4041
deltachat-rpc-server now reads the next request as soon as previous request handler is spawned.
- Enable `auto_vacuum` on all SQL connections. 2955
- Replace `r2d2` connection pool with an own implementation. 4050 4053 4043 4061
This change improves reliability
by closing all database connections immediately when the context is closed.

API-Changes

- Remove `MimeMessage::from_bytes()` public interface. 4033
- BREAKING Types: jsonrpc: `get_messages` now returns a map with `MessageLoadResult` instead of failing completely if one of the requested messages could not be loaded. 4038
- Add `dc_msg_set_subject()`. C-FFI 4057
- Mark python bindings as supporting typing according to PEP 561 4045