This change enables clippy::use_self in workspace lint configuration so the rule is enforced consistently. It also updates existing Rust codec code to conform to the newly enabled lint without changing behavior.

• Workspace lint configuration

  • Added use_self = "warn" under [lints.clippy] in:
    • root Cargo.toml
    • fuzz/Cargo.toml (to keep fuzz crate lint settings aligned with workspace expectations)

• Code updates required by use_self

  • Replaced explicit type repetitions with Self in constructors/default impls and associated method calls:
    • src/rust/integer_compression/fastpfor.rs
    • src/rust/integer_compression/just_copy.rs
    • src/rust/integer_compression/variable_byte.rs

• Representative change

  impl VariableByte {
      #[must_use]
      pub fn new() -> Self {
          Self
      }
  }
  
  impl Default for VariableByte {
      fn default() -> Self {
          Self::new()
      }
  }

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