fix for issue 100, crash on reuse

[msimerson]

Fixes #100
Fixes #91

📑 Description

Refactored client/udp.js with:

• fix: drop mismatched IDs
• fix: filter senders by resolver port
• fix: write Packet.parse in a try/catch
• fix: handle socket errors
• feat: proper cleanup / teardown
• feat: add a default 10s timeout (configurable)
• feat: expand transaction IDs to 16-bit using crypto.randomInt(0x10000)

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed
• I have added tests that exercise the bug in the issue and verify the changes add it

[msimerson]

Note: unfortunately, this PR also has the commit from #103. Without it the tests would be unable to pass. Once #103 lands, I can rebase this and shrink the PR, or it can be cherry picked.

[lsongdev]

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