test: add custom-uncommon-cta-vesa

This is a hand-crafted EDID taken from edid-decode (test/cta-vesa.test). It contains uncommon blocks: VESA Display Transfer Characteristics Data Block and VESA Video Display Device Data Block in the CTA-861 extension.

While it's not as good as a real-world EDID, it can still improve our test coverage and ensure we behave like edid-decode.