api!: remove key_gen_type config #18417

Job	Run time
Rust doc comments	20s
cargo deny	32s
Lint Rust	2m 30s
Check provider database	6s
Build C library (ubuntu-latest)	2m 33s
Python lint	13s
Build C library (macos-latest)	2m 58s
Build deltachat-rpc-server (ubuntu-latest)	2m 8s
Rust tests (ubuntu-latest, 1.84.1)	2m 57s
Build deltachat-rpc-server (macos-latest)	8m 46s
Rust tests (windows-latest, 1.84.1)	9m 5s
Build deltachat-rpc-server (windows-latest)	5m 10s
Rust tests (macos-latest, 1.84.1)	2m 51s
Rust tests (ubuntu-latest, 1.81.0)	3m 2s
CFFI Python tests (ubuntu-latest, 3.13)	4m 26s
CFFI Python tests (macos-latest, 3.13)	4m 37s
CFFI Python tests (ubuntu-latest, pypy3.10)	5m 17s
CFFI Python tests (macos-latest, pypy3.10)	5m 34s
CFFI Python tests (ubuntu-latest, 3.8)	4m 26s
JSON-RPC Python tests (ubuntu-latest, 3.13)	2m 5s
JSON-RPC Python tests (macos-latest, 3.13)	1m 33s
JSON-RPC Python tests (windows-latest, 3.13)	2m 36s
JSON-RPC Python tests (ubuntu-latest, pypy3.10)	2m 10s
JSON-RPC Python tests (macos-latest, pypy3.10)	2m 20s
JSON-RPC Python tests (ubuntu-latest, 3.8)	1m 53s
	1h 20m 8s

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