Code owners for the indexation (#2557)

## Description
Adds new codeowner for the `indexation` module.

Author: GeorgeBake

.github/CODEOWNERS

@@ -8,4 +8,7 @@ crates/fuel-gas-price-algorithm @xgreenx @Dentosal @MitchTurner @rafal-ch
 crates/services/txpool_v2 @xgreenx @Dentosal @MitchTurner @AurelienFT
 
 # Code owners for the gas price service (v0 & v1)
-crates/services/gas_price_service @xgreenx @Dentosal @MitchTurner @rymnc
+crates/services/gas_price_service @xgreenx @Dentosal @MitchTurner @rymnc
+
+# Code owners for the indexation
+crates/fuel-core/src/graphql_api/indexation @xgreenx @Dentosal @MitchTurner @rafal-ch