add full SS58 prefix support

[mcjkula]

Summary

• support standard SS58 account prefixes 0 through 16383 across SDKs
• add one-byte and two-byte boundary conformance vectors
• keep behavior scoped to standard 32-byte account IDs

Tests

• cd rust && cargo test
• cd python && ../.venv/bin/python -m pytest tests/
• cd typescript && npm test && npm run lint
• cd go && go test ./...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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