Exclude sqlite_% from listTables()

[MGatner]

Description
SQLite will ad-hoc add various tables prefixed "sqlite_" that function similar to MySQL's information_schema. See for example these metadata test results (https://travis-ci.org/codeigniter4/CodeIgniter4/jobs/586068130):

1) CodeIgniter\Database\Live\MetadataTest::testListTables
585Failed asserting that two arrays are equal.
586--- Expected
587+++ Actual
588@@ @@
589 Array (
590     0 => 'db_migrations'
591-    1 => 'db_user'
592-    2 => 'db_job'
593-    3 => 'db_misc'
594-    4 => 'db_empty'
595-    5 => 'db_secondary'
596+    1 => 'sqlite_sequence'
597+    2 => 'db_user'
598+    3 => 'db_job'
599+    4 => 'db_misc'
600+    5 => 'db_empty'
601+    6 => 'db_secondary'
602 )

... where sqlite_sequence is being returned as a table. I think these tables should be excluded as system data to be consistent with the other database drivers. E.g. if I use forge to add two tables to an empty database, listTables() should return two tables regardless of driver.

Checklist:

• Securely signed commits
• Component(s) with PHPdocs
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide