refactor(license): improve license expression normalization

[knqyf263]

Description

This PR modifies expression.NormalizeFunc to accept expression.Expression instead of string as its argument. This change allows for more flexible license normalization, particularly for compound licenses containing the WITH operator.

Current Issues

• The current implementation processes the Left and Right parts of WITH-containing licenses separately
• This separate processing can lead to suboptimal normalization when licenses should be treated as a single unit

Changes

• Modified expression.NormalizeFunc signature to accept expression.Expression
• Updated NormalizeLicense to properly handle composite licenses with WITH operator

Note

This change is expected to facilitate the implementation of #8077 by allowing easier replacement of non-SPDX licenses by returning expression.SimpleExpression{License: LicenseRef-xxx} format.

Related PRs

• fix(spdx): use the hasExtractedLicensingInfos field for licenses that are not listed in the SPDX #8077

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[knqyf263]

This is the main change.

[knqyf263]

Newly added a test case for compound licenses

[DmitriyLewen]

LGTM