Rust

move push_down_aggregation code to cnosdb #38

Job	Run time
cargo test (mac)	5m 12s
Check cargo fmt	50s
Verify Vendored Code	56s
cargo check	4m 6s
cargo test (win64)	9m 36s
check Cargo.toml formatting	0s
clippy	0s
check configs.md is up-to-date	0s
cargo test hash collisions (amd64)	0s
cargo doc	0s
cargo test (amd64)	0s
cargo test datafusion-cli (amd64)	0s
cargo test doc (amd64)	0s
cargo examples (amd64)	0s
Run sqllogictest with Postgres runner	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
	20m 40s

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