Be as lazy as possible wrt rpmal hash creation

- Separate provides and files hash creation, delay both until the last
  moment before first valid lookup. In practise, this means the provides
  hash is created early due to lookups from rpmtsAddInstallElement(),
  but the big bad file hash creation is delayed until the entire
  transaction set has been more-or-less populated. Which means we have
  a better idea about the necessary hash table size, meaning fewer
  hash resizes, resulting in good deal faster execution with no
  downsides - if something happened to trigger an early file lookup
  it'll all still work, just slower.

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