feat(client):support single instance

[0xbrayo]

Important

Add single_instance module to aw-client-rust to ensure single instance execution using file locks.

• Feature:
  • Add single_instance module in aw-client-rust/src/single_instance.rs to ensure only one instance of the client runs.
  • Uses file locks for synchronization, with platform-specific implementations for Windows and Unix-like systems.
• Dependencies:
  • Add libc, log, and thiserror to aw-client-rust/Cargo.toml.
  • Update dirs dependency to version 4.0 in aw-client-rust/Cargo.toml.
• Misc:
  • Add single_instance module to aw-client-rust/src/lib.rs.

^{This description was created by for 6a7fa3d. It will automatically update as commits are pushed.}

[0xbrayo]

Pending testing :)

[0xbrayo]

Did some testing on linux, works as expected. Will do windows later