- Updated fiverr_listings_stats to add category columns, gigs data columns, and 3 score columns
- Updated FiverrJsonImporter::computeListingsStatsRow() for category information
- Updated getSellerLevelNumeric() to handle additional values from fiverr_gigs seller__sellerLevel
- Modified table columns due to database "Array to string conversion" warnings
  - fiverr_gigs table:
    - openGraph__video from string to text
    - seller__vacation from string to text
    - seller__agency from string to text
    - Replaced string(seller__hourlyRate) with integer(seller__hourlyRate__priceInCents)
  - fiverr_seller_profiles table:
    - seller__vacation from string to text
    - seller__agency from string to text
- Added getSellerLevelAdjusted()
- Added calculateSellerLevelAdjustedStats()
- Added parseDeliveryTimeDays()
- Added extractGigFieldArrays()
- Added computeListingGigFieldAverages()
- Added computeScoresForStatsRow()