indexer-common,indexer-agent: Include reason for actions being added to queue

[fordN]

With the ultimate goal of including meaningful reason strings for each action added to the actions queue a number of changes have been made in this PR.

The process of resolving which deployments are worth allocating towards has been updated to now result in an array of allocation decisions with length equal to the number of subgraph deployments on the network, including both toAllocate and not toAllocate decisions (rather than an array of only subgraph ids to allocate to).

AllocationDecision {
  declare deployment: SubgraphDeploymentID
  declare toAllocate: boolean
  declare ruleMatch: RuleMatch
  }

In addition, the process of resolving allocation actions has been updated. reconcileAllocations and reconcileDeploymentAllocations have been replaced with reconcileActions,reconcileDeploymentActions and in the process been simplified and allowed for concurrency in reconciling many actions.

A few more structural changes have also been made to move some network querying functions into the NetworkMonitor.

[fordN]

Resolves #445

[hopeyen]

LGTM!