test: add ethdebug/conformance

[djolertrk]

Add conformance tests for ethdebug producers and consumers.

$ yarn --cwd packages/conformance test
 ✓ test/conformance.test.ts (5 tests) 2442ms
   ✓ @ethdebug/conformance > [bug] compiles BUG fixtures into valid ETHDebug programs 7ms
   ✓ @ethdebug/conformance > [solc] compiles Solidity fixtures and validates ETHDebug output 45ms
   ✓ @ethdebug/conformance > [soldb] checks solc ETHDebug resources through the SolDB consumer backend 34ms
   ✓ @ethdebug/conformance > [soldb] checks multi-source solc ETHDebug resources through the SolDB consumer backend 21ms
   ✓ @ethdebug/conformance > [soldb] checks source-line breakpoints against solc output on local anvil  2335ms

 Test Files  1 passed (1)
      Tests  5 passed (5)
   Start at  16:51:17
   Duration  3.02s (transform 220ms, setup 0ms, collect 430ms, tests 2.44s, environment 0ms, prepare 30ms)

[djolertrk]

cc @gnidan