chore(query): add v2 graphql schema and query files

Author: suchapalaver

crates/query/graphql/escrow_account_v2.query.graphql

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+# EscrowAccountQuery V2
+# 
+# This query is used to retrieve escrow account information for TAP v2/Horizon.
+#
+# Input Variables:
+# - $indexer (Bytes!): The address of the Indexer whose escrow accounts are being queried.
+# - $thawEndTimestamp (BigInt!): A timestamp used to filter signers whose thaw period has ended or is about to end.
+#
+# Query Logic:
+# - Fetches escrow accounts where the `receiver` is the provided $indexer.
+# - Returns the following information for each escrow account:
+#   - `balance`: The current balance of the escrow account.
+#   - `totalAmountThawing`: The total amount currently thawing in the escrow.
+# - Retrieves the payer (was sender in v1) and filters the payer's `signers` based on:
+#   - `thawEndTimestamp_lte`: Only includes signers whose thaw end timestamp is less than or equal to the provided $thawEndTimestamp.
+#   - `isAuthorized: true`: Only includes signers that are authorized.
+#
+# Key differences from v1:
+# - Uses Bytes instead of ID for indexer parameter
+# - References 'payer' instead of 'sender'
+# - Compatible with TAP v2 schema structure
+
+query EscrowAccountQuery($indexer: Bytes!, $thawEndTimestamp: BigInt!) {
+    escrowAccounts(where: { receiver: $indexer }) {
+        balance
+        totalAmountThawing
+        payer {
+            id
+            signers(where: {
+                thawEndTimestamp_lte: $thawEndTimestamp
+                isAuthorized: true
+            }) {
+                id
+            }
+        }
+    }
+}

crates/query/graphql/latest_ravs_v2.query.graphql

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+query LatestRavs(
+    $payer: ID!
+    $dataService: ID!
+    $serviceProvider: ID!
+    $collectionIds: [ID!]!
+) {
+    latestRavs(
+        where: {
+            payer: $payer
+            dataService: $dataService
+            serviceProvider: $serviceProvider
+            id_in: $collectionIds
+        }
+    ) {
+        id
+        valueAggregate
+        timestamp
+    }
+}