feat: implement From array trait for BoundedVec

[akonior]

Description

Problem*

Implementing a concise, single-line method for converting arrays to BoundedVec would enhance usability.

Summary*

This pull request implements the From trait to enable array-to-BoundedVec conversions, allowing for the following usage

let vec = BoundedVec::from([1, 2, 3]);

instead of:

let vec: BoundedVec<Field, 3> = BoundedVec::new();
vec.extend_from_array([1, 2, 3]);

Additional Context

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[github-actions]

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