Add SQL query for solver approvals monitoring

cowprotocol/monitoring/solver_approvals.sql

@@ -0,0 +1,39 @@
+with ranked as (
+    select
+        evt_tx_hash as tx_hash,
+        evt_block_time as block_time,
+        "from" as responsible_address,
+        spender,
+        contract_address as token,
+        a.value,
+        rank() over (partition by spender, contract_address order by evt_block_number desc, evt_index desc) as rk
+    from erc20_{{blockchain}}.evt_approval as a
+    inner join {{blockchain}}.transactions on evt_tx_hash = hash
+    where owner = 0x9008d19f58aabd9ed0d60971565aa8510560ab41
+),
+
+solvers as (
+    select
+        address,
+        environment,
+        name,
+        whitelisted as active
+    from dune.cowprotocol.solvers
+    where blockchain = '{{blockchain}}'
+)
+
+select --noqa: ST06
+    block_time,
+    tx_hash,
+    responsible_address,
+    case
+        when responsible_address = 0x05c5494572e4ab2d48d3ab3aaf6bd4e7b1c98382 or responsible_address = 0xd8ca5fe380b68171155c7069b8df166db28befdd then 'PROPOSER-ACCOUNT'
+        else coalesce(concat(environment, '-', name), 'NON-SOLVER')
+    end as responsible_solver,
+    spender,
+    token,
+    value
+from ranked as r
+left outer join solvers as s on r.responsible_address = s.address
+where rk = 1 and value > 0
+order by block_time desc