feat: include `duckdb-rs` as a submodule #9539

Job	Run time
Benchmark with Codspeed	4m 30s
Rust build (all-features)	10m 10s
Rust build (default features)	9m 30s
Rust build (with tokio dispatcher)	8m 46s
Check build with minimal dependencies	6m 25s
Rust build (with compio dispatcher)	8m 47s
Check generated proto/fbs files are up to date	1m 0s
License Check and Audit Check (advisories)	1m 8s
Rust build (with tokio+compio dispatcher)	9m 32s
lint-toml	2m 24s
License Check and Audit Check (bans licenses sources)	1m 8s
Rust build (wasm32 with default features)	3m 48s
miri	1m 40s
Python (test)	7m 44s
Python (lint)	4m 12s
Rust (docs)	4m 45s
Rust (lint)	1m 37s
Rust (tests)	11m 33s
validate-workflow-yaml	20s
wasm-integration	2m 40s
	1h 41m 39s

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