fix(pack): update `add()` to have default `load=false` during startup

Problem: the `load=true` in `vim.pack.add()` means that `:packadd` is
  executed even during startup. This leads to force source of 'plugin/',
  which breaks the intended loading order (`:h load-plugins`) and
  results into sourcing them twice. This also makes it ignore
  `--noplugin` argument.

  Using `:packadd!` during startup is more appropriate, while `:packadd`
  afterwards is still more favorable to actually force 'plugin/' source
  (as there is no pre-defined mechanism that will load them later).

Solution: have `load=false` default during startup, `true` - afterwards.

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