Implement conversion from ColumnStatistics to NullableInterval #25

Job	Run time
Check cargo fmt	45s
cargo check	4m 31s
build with wasm-pack	2m 6s
cargo test (macos)	11m 1s
Verify MSRV (Min Supported Rust Version)	6m 21s
cargo test (macos-aarch64)	10m 36s
Verify Vendored Code	59s
cargo test (win64)	36m 58s
check Cargo.toml formatting	2m 58s
cargo test hash collisions (amd64)	9m 1s
clippy	4m 42s
check configs.md is up-to-date	2m 32s
cargo doc	3m 34s
cargo test (amd64)	9m 28s
cargo test datafusion-cli (amd64)	3m 46s
cargo test doc (amd64)	11m 59s
Run sqllogictest with Postgres runner	3m 25s
cargo examples (amd64)	11m 47s
cargo test pyarrow (amd64)	2m 33s
verify benchmark results (amd64)	10m 3s
	2h 29m 5s

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