handle warnings

[tiye]

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[Copilot]

Pull request overview

This PR addresses warnings in the MoonBit codebase by updating deprecated API usages and migrating to newer syntax patterns. The changes ensure compatibility with current MoonBit language and standard library versions.

Changes:

• Migrated package configuration from moon.pkg.json to moon.pkg format
• Updated error handling from (try? ...).unwrap() to try! operator
• Updated iterator creation from Iterator::new() to Iter::new()
• Updated BigInt hexadecimal conversion from to_hex() to to_string(radix=16)
• Updated suberror declaration to use explicit constructor syntax and removed Default from derive clause
• Bumped package version to 0.2.3 and dependency version to 0.2.2

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/moon.pkg.json	Removed old JSON-based package configuration
src/moon.pkg	Added new package configuration with explicit imports for hashset, strconv, cirru-parser, and test imports
src/main/moon.pkg.json	Removed old JSON-based main package configuration
src/main/moon.pkg	Added new main package configuration with is-main option
src/main/main.mbt	Updated error handling from (try? ...).unwrap() to try! operator in three locations
src/list.mbt	Updated iterator creation from Iterator::new().iter() to Iter::new()
src/lib.mbt	Updated suberror syntax, error handling pattern, and BigInt hex conversion method
moon.mod.json	Bumped package version and dependency version

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