Tracking: featured app weights for TBAR

[meiersi-da]

Motivation

Implement the amendment for CIP-104:

• CIP change: Add FA weights to CIP-0104 spec canton-foundation/cips#238
• context: https://lists.sync.global/g/cip-discuss/message/796

Work Breakdown

• in a single release:
  • Daml: add featured app weights #6177
  • Scan: retrieve and apply app weights in activity record computation
    • retrieve the weights from the JSON payload to avoid a store version bump
    • use the max of all weights of a featured app party in case there are multiple
    • change

      splice/apps/scan/src/main/scala/org/lfdecentralizedtrust/splice/scan/rewards/AppActivityComputation.scala

      Line 96 in 8e7268e

      providers <- rewardsReferenceStore.lookupFeaturedAppPartiesAsOf(roundOpensAt)

      to lookup a Map[Party, Decimal] of featured app party weights
    • apply the weight here:

      splice/apps/scan/src/main/scala/org/lfdecentralizedtrust/splice/scan/rewards/AppActivityComputation.scala

      Lines 152 to 165 in 8e7268e

      	val aggregatedWeights = computeAggregatedWeights(
      	envelopesWithFeaturedAppConfirmers,
      	summary.totalTrafficCost,
      	totalFeaturedAppEnvelopesTraffic,
      	)
      	Some(
      	DbAppActivityRecordStore.AppActivityRecordT(
      	verdictRowId = DbAppActivityRecordStore.DUMMY_VERDICT_ROW_ID,
      	roundNumber = roundNumber,
      	appProviderParties = aggregatedWeights.keys.toSeq,
      	appActivityWeights = aggregatedWeights.values.toSeq,
      	)
      	)

      by multiplying every aggregatedWeight with its providers' activity weight. Consider renaming aggregatedWeight to aggregatedBurn to improve clarity.
• ideally in the same, but possibly in a later release:
  • SV UI: support activity weights for GrantFeaturedAppRight
  • SV UI: support new vote for UpdateFeaturedAppRight

Accepted limitation:

• self-featuring on DevNet via the Amulet Wallet only grants the default weight
  • use a Ledger API call to self-feature with non-default weights