fix: case-insensitive match for lowercase browser globals (#649)

[vsalomaki]

Compare browser globals case-insensitively;

• lowercase globals like "crypto" should match MDN interface name like "Crypto"
• e2e test for crypto.randomUUID() on Chrome 52 and Safari 14

Closes #649

[github-actions]

🎉 This PR is included in version 6.2.1 🎉

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[joshkel]

I believe this change is too broad: some MDN interfaces have corresponding lowercase browser globals, but not all do, and assuming that they all do results in false positives. See #684.