Migrate ignition-core to v-next

[kanej]

This is the first step in bringing Ignition into Hardhat 3.
We will do the migration one package at a time, the first will be ignition-core.

TODO

1. Move the ignition-core files under ./v-next
2. Update the code to match updated prettier and eslint rules
3. Re-enable API extractor checks as part of linting
4. Switch to ESM for the package
   1. Change any code patterns that are implied by this (e.g. switching to dynamic imports)
   2. Update or swap dependencies to work with ESM
5. Update unit tests (pnpm run test) until all are passing (retaining mocha for the moment)
6. Update Integration tests (pnpm run test:integrations) until all are passing (retaining mocha for the moment)