Private Struct Fields for Blockchain Types

[bitzoic]

Description

Updates the following blockchain types to have private struct variables:

• Address
• ContractId
• AssetId

Note: This PR merges into a staging branch

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).
• 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.

[K1-R1]

Changes look good, but with these fields now private how would these types be instantiated as constants or configureable constants?
Currently we are able to do:

configurable {
    SIGNER: Address = Address {
        value: ZERO_B256,
    },
}

Initialising with Address::from(ZERO_B256) would cause the error:

^^^^^^^^^^^^^^^^ Could not evaluate initializer to a const declaration.

[bitzoic]

Changes look good, but with these fields now private how would these types be instantiated as constants or configureable constants? Currently we are able to do:

configurable {
    SIGNER: Address = Address {
        value: ZERO_B256,
    },
}

Initialising with Address::from(ZERO_B256) would cause the error:

^^^^^^^^^^^^^^^^ Could not evaluate initializer to a const declaration.

What version of forc are you using to test this? I've added tests to add Address and ContractId using From implementation in configurable in this commit.

[K1-R1]

What version of forc are you using to test this? I've added tests to add Address and ContractId using From implementation in configurable in this commit.

I tried it with forc = "0.50.0". If it's working on this PR though it's a non-issue.