fix: pass file to transform getResolveAgainstDir function

feat: add getResolveAgainstDir option to runTransform

chore: fix tests in ESM mode

fix: use tsx instead of ts-node

test: fix tests

Merge pull request #21 from cebamps/fix/ast-types-init

Remove early initialization of nodePathPlugin that causes ast-types Scope to malfunction

fix: get ast-types scope basically working

fix: fix issues with import specifier replacement conversion

feat: add astx.flatMap()

fix(findImports): support string capture in import source