feat(pack): update `add()` to handle source change for installed plugin

Problem: Changing `src` of an existing plugin cleanly requires manual
  `vim.pack.del()` prior to executing `vim.pack.add()` with a new `src`.

Solution: Autodetect `src` change for an existing plugin (by comparing
  against lockfile data). If different - properly delete immediately and
  treat this as new plugin installation.

  Alternative solution might be to update `origin` remote in the
  installed plugin after calling `vim.pack.update()`. Although, doable,
  this 1) requires more code; and 2) works only for Git plugins (which
  might be not the only type of plugins in the future). Automatic
  "delete and clean install" feels more robust.

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