Resolve TODO and implement TryFrom<Bytes> for b256

[bitzoic]

NOTE: Do not merge until the next breaking release

Description

impl From<Bytes> for b256 has been removed and replaced with impl TryFrom<Bytes> for b256 increasing saftey when converting between the two types. impl Into<Bytes> for b256 and impl TryInto<b256> for Bytes have also been added.

This PR breaks the following implementation:

let mut my_bytes = Bytes::new();
my_bytes.push(1u8);

let result: b256 = b256::from(my_bytes);

The implementation should now be:

let mut my_bytes = Bytes::new();
my_bytes.push(1u8);

// Option 1
let result_1: Option<b256> = b256::try_from(my_bytes);
// Option 2
let result_2 = my_bytes.try_into();

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[SwayStar123]

No tests for the new into?

[bitzoic]

No tests for the new into?

They already exist and we're automatically generated here