Implement ScalarValue::Map #28760

Job	Run time
cargo check	5m 0s
build with wasm-pack	2m 21s
cargo test (macos)	10m 23s
cargo test (macos-aarch64)	9m 25s
cargo test (win64)	40m 31s
Check cargo fmt	39s
Verify MSRV (Min Supported Rust Version)	6m 29s
Verify Vendored Code	49s
cargo test datafusion-cli (amd64)	3m 46s
cargo doc	3m 28s
clippy	5m 2s
cargo test (amd64)	9m 20s
cargo test doc (amd64)	12m 42s
cargo examples (amd64)	12m 34s
Run sqllogictest with Postgres runner	3m 7s
cargo test pyarrow (amd64)	2m 34s
verify benchmark results (amd64)	10m 36s
check Cargo.toml formatting	2m 52s
check configs.md is up-to-date	2m 34s
cargo test hash collisions (amd64)	8m 44s
	2h 32m 56s

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