Handle both undefined and null the same way in bind parameters

[kigiri]

Right now, sqlite3 throws when we attempt to bind undefined.
Is this on design ? I would expect undefined and null to be handled the same way.

I forked and did a change that seems to modify the behavior, just checking if it's something you would accept a PR for or If i will have to keep my fork in sync.

I simply added:

  case "undefined": {
    // pass
    break;
  }

Here:

sqlite3/src/statement.ts

Lines 300 to 303 in c078d61

	}
	case "object": {
	if (param === null) {
	// pass