State Change Indexer: State Change Processors part 2

[gouthamp-stellar]

Implement Processors for 4 state changes:
Each processor will:

Extract relevant information from TokenTransferEvents or Operations.
Check if the associated accounts are relevant using relevantAcctService.
If relevant, update the in-memory maps (stateChangeMap, operationsMap, transactionMap).
Type-Specific Validation:
To ensure that each processor only handles the appropriate inputs, each processor should validate the input type before processing.
For example, a processor handling SetOptions operations should ignore Payment operations.

By defining a global list of processors, every TokenTransferEvent and Operation can be passed through each processor in the list. This would make adding new state change types easier - implement a new implementation of the interface and add it to the global list of processors

design: https://docs.google.com/document/d/10Z2Apl6gJYkJp0BXILWn5_vJL4MmZ0QZ4QrRqbW_EHw/edit?tab=t.0