add function ValidateAndNormalizeLicensesWithOptions

[elrayle]

Description

When validating licenses, a license can be valid (e.g. "mit") but not the canonical license (e.g. "MIT"). The existing ValidateLicenses* functions only return true | false to indicate that all the licenses were valid (true) or at least one license was invalid (false). In the case of invalid licenses, the list of invalid licenses is returned.

The new ValidateAndNormalizeLicensesWithOptions function returns a list normalized valid licenses and a list of invalid licenses. It also dedupes the valid licenses, so that if "MIT" and "mit" are both passed in, there is only one "MIT" license in the normalized license list.

[Copilot]

Pull request overview

This PR introduces a new validation API that both validates SPDX license inputs and returns a normalized, deduplicated list of valid licenses while separately reporting invalid entries. It also extends expression reconstruction so normalized output can include properly-parenthesized SPDX expressions.

Changes:

• Refactors ValidateLicensesWithOptions to delegate to a new ValidateAndNormalizeLicensesWithOptions API that returns (normalizedValid, invalid) lists.
• Adds normalization/deduplication behavior for valid licenses (including expressions via parse(...).reconstructedLicenseString()).
• Extends node.reconstructedLicenseString() to support expression nodes and adds tests covering expression reconstruction and the new validation API.

Show a summary per file

File	Description
spdxexp/satisfies.go	Adds ValidateAndNormalizeLicensesWithOptions and refactors existing validation to use it.
spdxexp/satisfies_test.go	Adds tests for normalized+invalid outputs across option combinations and dedup behavior.
spdxexp/node.go	Adds expression reconstruction support (including precedence/parentheses) used for normalization.
spdxexp/node_test.go	Adds coverage for expression reconstruction output/parentheses behavior.

Copilot's findings

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• Files reviewed: 4/4 changed files
• Comments generated: 2

[ljones140]

Looks great. A minor nit on the tests.