feat: Add conditional indexing to filter Safes by initiator/recipient address (#2703)

Implement selective Safe indexing on L2 networks to reduce database size and improve indexing speed by filtering out Safes created by specific initiators.

Changes:
- Add ETH_EVENTS_IGNORED_INITIATORS setting to define blocklisted initiators
- Add ETH_EVENTS_IGNORED_TO setting to define blocklisted recipients
- Override process_elements in SafeEventsIndexer to filter by tx._from or tx.to before storing EthereumTx records
- Optimize RPC calls: fetch transactions first, filter, then fetch receipts only for allowed transactions
- Add comprehensive tests for conditional indexing

Closes #2703

Author: Uxio0

config/settings/base.py

@@ -609,6 +609,15 @@
 ETH_ERC20_LOAD_ADDRESSES_CHUNK_SIZE = env.int(
     "ETH_ERC20_LOAD_ADDRESSES_CHUNK_SIZE", default=500_000
 )  # Load Safe addresses for the ERC20 indexer with a database iterator with the defined `chunk_size`
+ETH_EVENTS_IGNORED_INITIATORS: set[ChecksumAddress] = {
+    ChecksumAddress(HexAddress(HexStr(address)))
+    for address in env.list("ETH_EVENTS_IGNORED_INITIATORS", default=[])
+}  # Initiator addresses whose created Safes should be ignored during L2 indexing
+ETH_EVENTS_IGNORED_TO: set[ChecksumAddress] = {
+    ChecksumAddress(HexAddress(HexStr(address)))
+    for address in env.list("ETH_EVENTS_IGNORED_TO", default=[])
+}  # Transaction 'to' addresses to ignore during L2 indexing
+
 
 # ENABLE/DISABLE COLLECTIBLES DOWNLOAD METADATA, enable=True, disabled by default
 COLLECTIBLES_ENABLE_DOWNLOAD_METADATA = env.bool(