Handle type coercion in signature for `ApproxPercentileCont` #31784

Job	Run time
Check cargo fmt	38s
cargo check	5m 32s
build with wasm-pack	2m 40s
cargo test (macos)	10m 50s
cargo test (macos-aarch64)	10m 32s
Verify Vendored Code	52s
cargo test (win64)	44m 14s
Verify MSRV (Min Supported Rust Version)	6m 59s
cargo examples (amd64)	13m 29s
cargo doc	3m 56s
cargo test datafusion-cli (amd64)	3m 47s
cargo test (amd64)	9m 35s
cargo test doc (amd64)	14m 48s
Run sqllogictest with Postgres runner	3m 37s
verify benchmark results (amd64)	12m 15s
cargo test pyarrow (amd64)	2m 52s
check Cargo.toml formatting	2m 47s
clippy	6m 2s
check configs.md is up-to-date	2m 47s
cargo test hash collisions (amd64)	14m 24s
	2h 52m 36s

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