[support-mariadb-dumps-with-newline] Add new Base abstract class for …

…database engines

src/triki/base.cr

@@ -0,0 +1,5 @@
+class Triki
+  abstract struct Base
+    abstract def parse(obfuscator, config, input_io, output_io)
+  end
+end

src/triki/mysql.cr

@@ -2,7 +2,7 @@
 require "string_scanner"
 
 class Triki
-  struct Mysql
+  struct Mysql < Base
     alias Field = String?
     alias Fields = Array(Field)
     alias Rows = Array(Fields)

src/triki/postgres.cr

@@ -1,5 +1,5 @@
 class Triki
-  struct Postgres
+  struct Postgres < Base
     include Triki::ConfigScaffoldGenerator
 
     # Postgres uses COPY statements instead of INSERT and look like:

src/triki/sql_server.cr

@@ -1,5 +1,5 @@
 class Triki
-  struct SqlServer
+  struct SqlServer < Base
     include Triki::InsertStatementParser
     include Triki::ConfigScaffoldGenerator