feat(eldritch): add dns library with list_a_records

[Cictrone]

Description

This PR introduces a brand new module into the Eldritch Standard Library: eldritch-libdns. The library enables DNS lookups within Eldritch scripts.

Changes Made

• Added a new DnsLibrary trait under newly created eldritch-libdns Rust crate package.
• Implemented list_a_records(domain, nameserver) function exposing A-record lookup capabilities.
• Wired up fake bindings (DnsLibraryFake) for internal tests, WebAssembly UI target (eldritch-wasm), and Repl mock modes.
• Wired up std bindings (StdDnsLibrary) heavily leveraging the hickory-resolver crate dependency to perform true network lookups (optionally accepting a custom DNS nameserver parameter).
• Registered and embedded eldritch-libdns appropriately into eldritch/Cargo.toml as a primary workspace-level standard library.

Verification

• Builds and passes standard tests (cargo test -p eldritch).
• Integrated to test appropriately in isolation and properly integrated in the root interpreter tree.

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
719	719	0	0	0	0	1ms

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#1985	✅	719	719	0	0	0	0	41.6s

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
719	0	0	5.5s

Test Changes

0 test added, 0 removed

Slowest Tests

Test 📝	Results 📊	Duration (avg) ⏱️	Duration (p95) ⏱️
TestDockerExecutor_Build_ContextCancellation	1	5.5s	5.5s
TestInteractiveShell	1	5.1s	5.1s
TestOtherStreamOutput	1	5.0s	5.0s
TestDockerExecutor_Build_SimpleEcho	1	2.8s	2.8s
TestDockerExecutor_Build_StreamsOutputInRealTime	1	1.4s	1.4s
TestGetRandomName/NoDuplicates	1	1.4s	1.4s
TestGetRandomName	1	1.4s	1.4s
TestCreateTestData	1	1.3s	1.3s
TestAPI	1	1.1s	1.1s
TestNonInteractiveShell	1	1.0s	1.0s

_{🎉 No failed tests in this run. | 🍂 No flaky tests in this run.}

Github Test Reporter by CTRF 💚

🔄 This comment has been updated

[Cictrone]

Adding details for binary size comparison:

main debug linux: 325.17 MB
branch debug linux: 326.88 MB

main release linux: 8.84 MB
branch release linux: 8.85 MB

results:

0.53% debug binary size increase
0.11% release binary size increase