refactor: replace blsful implementation with blst for threshold BLS signatures

- Updated dependencies in Cargo.toml and Cargo.lock to use the blst library.
- Removed blsful module and its associated code, including type conversions and utility functions.
- Introduced a new blst_impl module for the BLST implementation of threshold BLS signatures.
- Refactored tbls module to utilize the new blst implementation.
- Cleaned up error handling and types to align with the new library.
- Added workspace lints and improved documentation throughout the codebase.

Author: varex83

Cargo.lock

@@ -31,10 +31,10 @@ hex = { version = "^0.4.3" }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "^1.0" }
 tokio = { version = "1", features = ["full"] }
-blsful = "2.5.7"
-rand_core = "0.9.3"
+blst = "0.3.13"
+rand_core = "0.6"
 thiserror = "2.0.12"
-rand = "0.9"
+rand = {version = "0.8", features = ["std_rng"]}
 
 [workspace.lints.rust]
 missing_docs = "deny"

Cargo.toml

@@ -8,10 +8,24 @@ publish.workspace = true
 
 [dependencies]
 rand.workspace = true
-blsful.workspace = true
+blst.workspace = true
 rand_core.workspace = true
 serde.workspace = true
 thiserror.workspace = true
+hex.workspace = true
 
-[lints]
-workspace = true
+[lints.rust]
+# Allow unsafe code for blst C bindings (overrides workspace forbid)
+unsafe_code = "allow"
+missing_docs = "deny"
+
+[lints.clippy]
+arithmetic_side_effects = "deny"
+cast_lossless = "deny"
+cast_possible_truncation = "deny"
+cast_possible_wrap = "deny"
+cast_precision_loss = "deny"
+cast_sign_loss = "deny"
+needless_return = "deny"
+panicking_overflow_checks = "deny"
+unwrap_used = "deny"