Drop decimal and octal support from bytes macros

[leighmcculloch]

What

Restrict bytes! and bytesmin! to hex (0x) and binary (0b) integer literals only. Decimal and octal inputs now produce a compile error with a message directing users to hex or binary. Updates documentation and removes tests for the dropped forms, replacing them with tests that assert the compile error is emitted.

Why

Decimal and octal are uncommon ways to express byte data and were never an intentional design goal. Supporting them adds maintenance burden for edge cases (e.g. leading zero handling #41) that don't serve the crate's core purpose of specifying binary data in hex or binary notation. Because removal produces a compile error rather than a silent behavior change, users who relied on these forms will see an immediate, actionable failure.

Close #41
Close #42

Downstream

The soroban-sdk will be updated to use the new version and its docs that it exposes about the macros will need updating as well.

Merging

Intending for merging to main after #43.

[Copilot]

Pull request overview

This PR narrows the bytes! and bytesmin! proc-macros to accept only hex (0x) and binary (0b) integer literals, removing support for decimal and octal forms and replacing prior behavior/tests with explicit compile errors.

Changes:

• Enforced hex/binary-only literal forms in bytes and bytesmin implementations, emitting a targeted compile error for other bases.
• Updated crate-level documentation examples to use 0x-prefixed literals and explicitly state decimal/octal are unsupported.
• Replaced decimal/octal behavioral tests with tests asserting the new compile error output.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/lib.rs	Updates macro documentation to reflect hex/binary-only support and adjusts examples accordingly.
src/bytes.rs	Rejects non-0x/0b literals and updates tests to assert the new compile error for decimal/octal inputs.
src/bytesmin.rs	Adds non-0x/0b rejection logic and updates tests to assert the compile error for decimal/octal inputs.

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