MDEV-17841 S3 storage engine

A read-only storage engine that stores it's data in (aws) S3

To store data in S3 one could use ALTER TABLE:
ALTER TABLE table_name ENGINE=S3

libmarias3 integration done by Sergei Golubchik
libmarias3 created by Andrew Hutchings

mysql-test/suite/s3/suite.pm

@@ -0,0 +1,8 @@
+package My::Suite::S3;
+
+@ISA = qw(My::Suite);
+
+return "Need S3 engine" unless $::mysqld_variables{'s3'} eq "ON";
+
+bless { };
+