feat: add notarization support to MakerPKG

[MarshallOfSound]

Summarize your changes:

This PR adds macOS notarization support to the MakerPKG maker. When both a signing identity and osxNotarize configuration are provided, the generated PKG file will be automatically notarized using the @electron/notarize package.

Changes:

• Added @electron/notarize dependency to MakerPKG
• Updated MakerPKG.make() to accept forgeConfig parameter containing packager configuration
• Implemented conditional notarization logic that runs when:
  • A signing identity is configured in the maker options
  • osxNotarize configuration is present in the forge config
• Added comprehensive test coverage for notarization scenarios:
  • Notarization occurs when both identity and osxNotarize are configured
  • Notarization is skipped when signing identity is missing
  • Notarization is skipped when osxNotarize configuration is missing
• Updated existing tests to pass the required forgeConfig parameter

Test Plan:

Added unit tests covering all notarization scenarios. Existing tests pass with the new forgeConfig parameter requirement.

https://claude.ai/code/session_01AUVesVk6mwR9JX2WoKwiEi