feat: parallelize IMAP and SMTP connection attempts #15953

Job	Run time
Lint Rust	2m 20s
cargo deny	1m 19s
Check if node constants are up to date	6s
Check provider database	4s
Build C library (ubuntu-latest)	3m 0s
Build C library (macos-latest)	2m 25s
Rust doc comments	14s
Python lint	14s
Build deltachat-rpc-server (ubuntu-latest)	2m 27s
Rust tests (ubuntu-latest, 1.80.1)	4m 12s
Rust tests (windows-latest, 1.80.1)	8m 57s
Rust tests (macos-latest, 1.80.1)	2m 53s
Build deltachat-rpc-server (macos-latest)	2m 35s
Build deltachat-rpc-server (windows-latest)	6m 31s
Rust tests (ubuntu-latest, 1.77.0)	3m 14s
CFFI Python tests (ubuntu-latest, 3.12)	5m 26s
CFFI Python tests (macos-latest, 3.12)	4m 59s
CFFI Python tests (ubuntu-latest, pypy3.10)	8m 16s
CFFI Python tests (macos-latest, pypy3.10)	6m 16s
CFFI Python tests (ubuntu-latest, 3.7)	5m 51s
JSON-RPC Python tests (ubuntu-latest, 3.12)	2m 0s
JSON-RPC Python tests (macos-latest, 3.12)	2m 13s
JSON-RPC Python tests (windows-latest, 3.12)	2m 55s
JSON-RPC Python tests (ubuntu-latest, pypy3.10)	2m 30s
JSON-RPC Python tests (macos-latest, pypy3.10)	2m 40s
JSON-RPC Python tests (ubuntu-latest, 3.7)	1m 58s
	1h 25m 35s

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