[improve](binlog) Reserve ids for binlog type allocation (#43769)

### What problem does this PR solve?

Problem Summary:

Keep some IDs for allocation so that when new binlog types are added in
the future, the changes can be picked back to the old versions without
breaking compatibility.

The code will check the IDs of binlog types. Any binlog types whose IDs
are greater than or equal to MIN_UNKNOWN will be ignored.

fe/fe-core/src/main/java/org/apache/doris/binlog/BinlogManager.java

@@ -588,8 +588,13 @@ public long read(DataInputStream dis, long checksum) throws IOException {
                     continue;
                 }
 
-                // Step 2.2: check if there is in next db Binlogs region
                 long dbId = binlog.getDbId();
+                if (binlog.getType().getValue() >= TBinlogType.MIN_UNKNOWN.getValue()) {
+                    LOG.warn("skip unknown binlog, type: {}, db: {}", binlog.getType().getValue(), dbId);
+                    continue;
+                }
+
+                // Step 2.2: check if there is in next db Binlogs region
                 if (dbId != currentDbId) {
                     // if there is in next db Binlogs region, check and update metadata
                     Database db = Env.getCurrentInternalCatalog().getDbNullable(dbId);

gensrc/thrift/FrontendService.thrift

@@ -1030,6 +1030,122 @@ enum TBinlogType {
   RENAME_TABLE = 14,
   RENAME_COLUMN = 15,
   MODIFY_COMMENT = 16,
+
+  // Keep some IDs for allocation so that when new binlog types are added in the
+  // future, the changes can be picked back to the old versions without breaking
+  // compatibility.
+  //
+  // The code will check the IDs of binlog types, any binlog types whose IDs are
+  // greater than or equal to MIN_UNKNOWN will be ignored.
+  //
+  // For example, before you adding new binlog type MODIFY_XXX:
+  //    MIN_UNKNOWN = 17,
+  //    UNKNOWN_2 = 18,
+  //    UNKNOWN_3 = 19,
+  // After adding binlog type MODIFY_XXX:
+  //    MODIFY_XXX = 17,
+  //    MIN_UNKNOWN = 18,
+  //    UNKNOWN_3 = 19,
+  MIN_UNKNOWN = 17,
+  UNKNOWN_2 = 18,
+  UNKNOWN_3 = 19,
+  UNKNOWN_4 = 20,
+  UNKNOWN_5 = 21,
+  UNKNOWN_6 = 22,
+  UNKNOWN_7 = 23,
+  UNKNOWN_8 = 24,
+  UNKNOWN_9 = 25,
+  UNKNOWN_10 = 26,
+  UNKNOWN_11 = 27,
+  UNKNOWN_12 = 28,
+  UNKNOWN_13 = 29,
+  UNKNOWN_14 = 30,
+  UNKNOWN_15 = 31,
+  UNKNOWN_16 = 32,
+  UNKNOWN_17 = 33,
+  UNKNOWN_18 = 34,
+  UNKNOWN_19 = 35,
+  UNKNOWN_20 = 36,
+  UNKNOWN_21 = 37,
+  UNKNOWN_22 = 38,
+  UNKNOWN_23 = 39,
+  UNKNOWN_24 = 40,
+  UNKNOWN_25 = 41,
+  UNKNOWN_26 = 42,
+  UNKNOWN_27 = 43,
+  UNKNOWN_28 = 44,
+  UNKNOWN_29 = 45,
+  UNKNOWN_30 = 46,
+  UNKNOWN_31 = 47,
+  UNKNOWN_32 = 48,
+  UNKNOWN_33 = 49,
+  UNKNOWN_34 = 50,
+  UNKNOWN_35 = 51,
+  UNKNOWN_36 = 52,
+  UNKNOWN_37 = 53,
+  UNKNOWN_38 = 54,
+  UNKNOWN_39 = 55,
+  UNKNOWN_40 = 56,
+  UNKNOWN_41 = 57,
+  UNKNOWN_42 = 58,
+  UNKNOWN_43 = 59,
+  UNKNOWN_44 = 60,
+  UNKNOWN_45 = 61,
+  UNKNOWN_46 = 62,
+  UNKNOWN_47 = 63,
+  UNKNOWN_48 = 64,
+  UNKNOWN_49 = 65,
+  UNKNOWN_50 = 66,
+  UNKNOWN_51 = 67,
+  UNKNOWN_52 = 68,
+  UNKNOWN_53 = 69,
+  UNKNOWN_54 = 70,
+  UNKNOWN_55 = 71,
+  UNKNOWN_56 = 72,
+  UNKNOWN_57 = 73,
+  UNKNOWN_58 = 74,
+  UNKNOWN_59 = 75,
+  UNKNOWN_60 = 76,
+  UNKNOWN_61 = 77,
+  UNKNOWN_62 = 78,
+  UNKNOWN_63 = 79,
+  UNKNOWN_64 = 80,
+  UNKNOWN_65 = 81,
+  UNKNOWN_66 = 82,
+  UNKNOWN_67 = 83,
+  UNKNOWN_68 = 84,
+  UNKNOWN_69 = 85,
+  UNKNOWN_70 = 86,
+  UNKNOWN_71 = 87,
+  UNKNOWN_72 = 88,
+  UNKNOWN_73 = 89,
+  UNKNOWN_74 = 90,
+  UNKNOWN_75 = 91,
+  UNKNOWN_76 = 92,
+  UNKNOWN_77 = 93,
+  UNKNOWN_78 = 94,
+  UNKNOWN_79 = 95,
+  UNKNOWN_80 = 96,
+  UNKNOWN_81 = 97,
+  UNKNOWN_82 = 98,
+  UNKNOWN_83 = 99,
+  UNKNOWN_84 = 100,
+  UNKNOWN_85 = 101,
+  UNKNOWN_86 = 102,
+  UNKNOWN_87 = 103,
+  UNKNOWN_88 = 104,
+  UNKNOWN_89 = 105,
+  UNKNOWN_90 = 106,
+  UNKNOWN_91 = 107,
+  UNKNOWN_92 = 108,
+  UNKNOWN_93 = 109,
+  UNKNOWN_94 = 110,
+  UNKNOWN_95 = 111,
+  UNKNOWN_96 = 112,
+  UNKNOWN_97 = 113,
+  UNKNOWN_98 = 114,
+  UNKNOWN_99 = 115,
+  UNKNOWN_100 = 116,
 }
 
 struct TBinlog {