Add new tests

Author: AdrienVannson

tests/inputs/encoding_decoding/encoding_decoding.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package encoding_decoding;
+
+message Overflow32 {
+    uint32 uint = 1;
+    int32 int = 2;
+    sint32 sint = 3;
+}
+
+message Overflow64 {
+    uint64 uint = 1;
+    int64 int = 2;
+    sint64 sint = 3;
+}

tests/inputs/manual_validation/manual_validation.proto

@@ -0,0 +1,7 @@
+syntax = "proto3";
+
+package manual_validation;
+
+message Msg {
+    uint32 x = 1;
+}