style: Use pre-commit tool and add simple config (#2029)

I started with really simple pre-commit hooks and will add more on top.

Important files:
- `.pre-commit-config.yaml` - the config for pre-commit
- `.github/workflows/pre-commit.yml` - runs pre-commit hooks in branches
and `develop`
- `.github/workflows/pre-commit-autoupdate.yml` - autoupdates pre-commit
hooks once in a month

docs/examples/config/example-config.json

@@ -21,7 +21,7 @@
             //
             // Below options will use defaults from cassandra driver if left unspecified.
             // See https://docs.datastax.com/en/developer/cpp-driver/2.17/api/struct.CassCluster/ for details.
-            // 
+            //
             // "queue_size_io": 2
             //
             // ---
@@ -113,7 +113,7 @@
     "cache": {
         // Configure this to use either "num_diffs", "num_cursors_from_diff", or "num_cursors_from_account". By default, Clio uses "num_diffs".
         "num_diffs": 32, // Generate the cursors from the latest ledger diff, then use the cursors to partition the ledger to load concurrently. The cursors number is affected by the busyness of the network.
-        // "num_cursors_from_diff": 3200, // Read the cursors from the diff table until we have enough cursors to partition the ledger to load concurrently. 
+        // "num_cursors_from_diff": 3200, // Read the cursors from the diff table until we have enough cursors to partition the ledger to load concurrently.
         // "num_cursors_from_account": 3200, // Read the cursors from the account table until we have enough cursors to partition the ledger to load concurrently.
         "num_markers": 48, // The number of markers is the number of coroutines to load the cache concurrently.
         "page_fetch_size": 512, // The number of rows to load for each page.