Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[x] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

What changes did you make? (Give an overview)

This change updates code-path-analyzer to support component syntax, which is the primary method of writing React components at Meta.

In particular, any rules which rely on onCodePathStart / onCodePathEnd don't trigger correctly when using component syntax.

For example, given the following components:

export component ComponentWithUnreachableLoop() {
  for (let i = 0; i < 100; i++) {
    break;
  }
  return null;
}

export component ComponentWithFunctionWithUnreachableLoop() {
  function loop() {
    for (let i = 0; i < 100; i++) {
      break;
    }
  }
  loop();
  return null;
}

the no-unreachable-loop rule would only trigger on the 2nd component, but not the first one. This is because, for the first component, the start of the component's body is represented by a ComponentDeclaration node and so currently nothing is starting a new code path nor ending a code path. In the 2nd case, it triggers correctly because we have an additional function wrapper, and so the FunctionDeclaration properly begins and ends the code path.

With the changes from this PR, the first component now properly triggers the lint warning:

Is there anything you'd like reviewers to focus on?