chore: upgrade opendal and adopt jiff

[tisonkun]

Newer OpenDAL version uses jiff which is proper maintained with better documented features.

... also remove now unnecessary once_cell dep since they are provided from std::sync.

[Copilot]

Pull request overview

This PR upgrades OpenDAL from version 0.53.3 to 0.55.0 and migrates the project's datetime handling from chrono to jiff, which is better maintained and has better documented features. Additionally, it removes the once_cell dependency in favor of the standard library's LazyLock (available since Rust 1.80), and relocates the build.rs file from src/build.rs to the standard build.rs location at the crate root.

• Migrated all datetime handling from chrono to jiff library
• Replaced once_cell::sync::Lazy with std::sync::LazyLock throughout the codebase
• Upgraded OpenDAL dependency from 0.53.3 to 0.55.0

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
Cargo.toml	Updated workspace dependencies from chrono to jiff
bindings/python/Cargo.toml	Removed chrono and once_cell dependencies, added jiff
bindings/python/src/lib.rs	Replaced once_cell::sync::Lazy with std::sync::LazyLock
crates/fluss/Cargo.toml	Removed build script path, updated chrono to jiff, removed once_cell, upgraded OpenDAL to 0.55.0, added wasm32 target with jiff js feature
crates/fluss/build.rs	Relocated from src/build.rs to standard build.rs at crate root
crates/fluss/src/io/file_io.rs	Migrated from chrono::DateTime<Utc> to jiff::Timestamp for file metadata timestamps
crates/fluss/src/row/datum.rs	Migrated from chrono::NaiveDate to jiff::civil::Date, updated Date methods to use jiff's type system (return types changed from i32 to i16/i8)
crates/fluss/tests/integration/admin.rs	Replaced once_cell::sync::Lazy with std::sync::LazyLock
crates/fluss/tests/integration/table.rs	Replaced once_cell::sync::Lazy with std::sync::LazyLock
crates/fluss/tests/integration/table_remote_scan.rs	Replaced once_cell::sync::Lazy with std::sync::LazyLock

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[luoyuxia]

@tisonkun Thank you very much. LGTM