Maven endpoint support (#180)

* Basic maven endpoint

* Clean up maven endpoint

* cargo sqlx prepare

* Minor cleanup

* Remove indentation

* Borrow &str instead of &String

* Refactor mod_data-getting

sqlx-data.json

@@ -310,6 +310,27 @@
       ]
     }
   },
+  "153100dc632392c4d446cc768235d071bac26a0818a4a72d203d8e549f969eea": {
+    "query": "SELECT id FROM versions WHERE mod_id = $1 AND version_number = $2",
+    "describe": {
+      "columns": [
+        {
+          "ordinal": 0,
+          "name": "id",
+          "type_info": "Int8"
+        }
+      ],
+      "parameters": {
+        "Left": [
+          "Int8",
+          "Text"
+        ]
+      },
+      "nullable": [
+        false
+      ]
+    }
+  },
   "15b8ea323c2f6d03c2e385d9c46d7f13460764f2f106fd638226c42ae0217f75": {
     "query": "\n            DELETE FROM notifications\n            WHERE user_id = $1\n            ",
     "describe": {
@@ -4283,6 +4304,32 @@
       "nullable": []
     }
   },
+  "cdd51904a4617d8a2616d9ad4b4274fa2e66e87db1825496854021a26798207c": {
+    "query": "\n            SELECT version_number, release_channels.channel channel\n            FROM versions\n            LEFT JOIN release_channels ON release_channels.id = versions.release_channel\n            WHERE mod_id = $1\n            ",
+    "describe": {
+      "columns": [
+        {
+          "ordinal": 0,
+          "name": "version_number",
+          "type_info": "Varchar"
+        },
+        {
+          "ordinal": 1,
+          "name": "channel",
+          "type_info": "Varchar"
+        }
+      ],
+      "parameters": {
+        "Left": [
+          "Int8"
+        ]
+      },
+      "nullable": [
+        false,
+        false
+      ]
+    }
+  },
   "cdd7f8f95c308d9474e214d584c03be0466214da1e157f6bc577b76dbef7df86": {
     "query": "\n            DELETE FROM hashes\n            WHERE file_id = $1\n            ",
     "describe": {