fix(api): improve perf for /api/v1/app/dashboard

[guybrush]

found some parts that can run concurrently:

• getSyncCommitteeStatistics: getExpectedSyncCommitteeSlots, getSyncCommitteeSlotsStatistics
• getGeneralValidatorInfoForAppDashboard: the initial vali-query besides already existing routines
• getValidatorExecutionPerformance: 3 concurrent routines vs everything at once

its hard to bench this but it should be a lot better since some parts are really heavy

here are some numbers to get a gist

WARN[0010] timingsObserver: getSyncCommitteeStatistics: total duration 1.554843646s
getSyncCommitteeSlotsStatistics: 1.554830162s
  getExpectedSyncCommitteeSlots: 1.510015578s 
WARN[0010] timingsObserver: getValidatorExecutionPerformance: total duration 2.678415806s
        getBlocks: 2.678294847s
   getPerformance: 916.856756ms
getFirstEpochTime: 282.770812ms 
WARN[0011] timingsObserver: getGeneralValidatorInfoForAppDashboard: total duration 3.665749851s
     GetCurrentDayClIncome: 3.665475577s
GetValidatorBalanceHistory: 947.228332ms
             getValidators: 920.865975ms
   GetLastAttestationSlots: 739.37852ms
                 aggregate: 11.996µs 
WARN[0011] timingsObserver: ApiDashboard: total duration 3.790604309s
getGeneralValidatorInfoForAppDashboard: 3.665851249s
      getValidatorExecutionPerformance: 2.678560807s
             getValidatorEffectiveness: 2.057824362s
            getSyncCommitteeStatistics: 1.554991527s
                getProposalLuckStats+1: 1.258281534s
               getRocketpoolValidators: 911.346472ms
     getSyncCommitteeInfoForValidators: 409.354864ms
                           getEpoch-10: 264.753654ms
                    getRocketpoolStats: 249.302946ms
                            getEpoch-1: 249.154268ms
   getSyncCommitteeInfoForValidators+1: 125.429342ms 

• getSyncCommitteeStatistics would have taken 1.510015578s longer
• getGeneralValidatorInfoForAppDashboard would have taken 920.865975ms longer
• getValidatorExecutionPerformance would have taken 916.856756ms + 282.770812ms longer

[manuelsc]

utack