new feature(java binding): Use std::thread::available_parallelism to replace num_cpus

[Xuanwo]

Feature Description

opendal/bindings/java/Cargo.toml

Line 160 in e869a70

num_cpus = "1.15.0"

Java binding uses num_cpus to get cpu cores. It's better to replace with std's available_parallelism.

Problem and Solution

Use std::thread::available_parallelism to replace num_cpus

Additional Context

No response

Are you willing to contribute to the development of this feature?

• Yes, I am willing to contribute to the development of this feature.

[miroim]

If no one is working on this, I would like to give it a try.

[Xuanwo]

If no one is working on this, I would like to give it a try.

Thanks, welcome to give it a try!