feat: integrate blsful implementation and refactor tbls module

- Added `thiserror` dependency for improved error handling.
- Introduced `blsful` module for TBLS implementation.
- Refactored `tbls` module to utilize new types and error handling.
- Created `tblsconv` module for type conversions between byte slices and cryptographic types.
- Removed the old `herumi` implementation and replaced it with the new `blsful` based implementation.
- Added utility functions for key and signature conversions.
- Updated types and error definitions for better clarity and consistency.

Author: varex83

Cargo.toml

@@ -36,6 +36,7 @@ chrono = { version = "0.4", features = ["serde"] }
 rand = "0.9"
 blsful = "2.5.7"
 rand_core = "0.9.3"
+thiserror = "2.0.12"
 
 [workspace.lints.clippy]
 arithmetic_side_effects = "deny"

crates/charon-crypto/Cargo.toml

@@ -11,6 +11,7 @@ rand.workspace = true
 blsful.workspace = true
 rand_core.workspace = true
 serde.workspace = true
+thiserror.workspace = true
 
 [lints]
 workspace = true