chore(spdx-licenses): drop members Composer never calls

getLicenses(), getExceptionByIdentifier(), getIdentifierByName(),
isOsiApprovedByIdentifier(), isDeprecatedByIdentifier() and the
LICENSES_FILE / EXCEPTIONS_FILE constants had no callers.

Unused members are normally kept so the port stays a faithful mirror of
the PHP class, but SpdxLicenses is pure logic over the bundled SPDX data
that holds no Composer state, and plugins reach the real PHP
implementation rather than this port, so nothing can observe the
difference. The struct now records what is left out and why.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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