feat: add support for TypeScript configs

[szymonrybczak]

Summary

Closes #1068

Added support for TypeScript configuration files and introduced defineWebpackConfig & defineRspackConfig helpers for fully typed configuration in @callstack/repack.

User-facing changes

• - Added support for TypeScript config files (.mts and .cts extensions)
• - Introduced defineWebpackConfig helper for fully typed webpack configuration
• - Introduced defineRspackConfig helper for fully typed rspack configuration

Test plan

• - tests pass
• - typecheck passes

[changeset-bot]

🦋 Changeset detected

Latest commit: e70ea7d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@callstack/repack	Major
@callstack/repack-plugin-expo-modules	Major
@callstack/repack-plugin-nativewind	Major
@callstack/repack-plugin-reanimated	Major
@callstack/repack-dev-server	Major
@callstack/repack-init	Major

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Name	Status	Preview	Comments	Updated (UTC)
repack-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 22, 2025 0:30am

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