perf: Introduce benchmarks for the BTreeSet data structure (#340)

- Added a new binary target `btreeset` in `benchmarks/Cargo.toml`.
- Created `benchmarks/btreeset/src/main.rs` with benchmark functions for
various `BTreeSet` operations, including:
    - `insert`
    - `remove`
    - `iter`
    - `range`
    - `union`
    - `intersection`
    - `symmetric_difference`
    - `is_subset`
    - `is_superset`
    - `is_disjoint`
- These benchmarks are generated for different key types (`u32`, `u64`,
and various `Blob` sizes).

Author: dragoljub-duric

benchmarks/Cargo.toml

@@ -33,3 +33,7 @@ path = "vec/src/main.rs"
 [[bin]]
 name = "compare"
 path = "compare/src/main.rs"
+
+[[bin]]
+name = "btreeset"
+path = "btreeset/src/main.rs"

benchmarks/btreeset/canbench.yml

@@ -0,0 +1,3 @@
+build_cmd: cargo build -p benchmarks --release --target wasm32-unknown-unknown --locked
+
+wasm_path: ../../target/wasm32-unknown-unknown/release/btreeset.wasm