message: [pdsl_core] Remove BitBlock::validate_index since it is no longer needed
  The pack_and_pos APIs are far superior.
diff: @@ -69,14 +69,6 @@ impl BitBlock {
  1 + ((n - 1) / Self::BITS)
  }
  - /// Checks if `n` is within bounds of a bit block and returns it if so.
  - fn validate_index(n: u32) -> BitBlockResult<u32> {
  - if n >= Self::BITS {
  - return Err(InvalidBitBlockIndex)
  - }
  - Ok(n)
  - }
  -
  /// Returns an immutable reference to the associated
  /// bit pack and the bit position within the bit pack
  /// for the given bit index.
  