feat(node/net): better BlockList shim

[DonIsaac]

What does this PR do?

Improves net.BlockList. Not a full implementation, but all methods now exist.

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

• I included a test for the new code, or existing tests cover it
• I ran my tests locally and they pass (bun-debug test test-file-name.test)

[robobun]

^{Updated 1:18 PM PT - Feb 7th, 2025}

❌ @DonIsaac, your commit adc431e has 2 failures in Build #11268:

• test/js/bun/http/serve-body-leak.test.ts - 5 failing on 🐧 3.20 x64
• test/js/bun/http/serve-body-leak.test.ts - 5 failing on 🐧 3.20 x64-baseline
• test/cli/install/bun-install-registry.test.ts - 1 failing on 🪟 2019 x64

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🧪   try this PR locally:

bunx bun-pr 17116