Add option for selecting tables to copy by a (regex) pattern

[sgraaf]

Besides just --all to select all tables, --table to select specific table, or --sql to run a custom SQL query, it would be nice to be able to select table to copy via a regex pattern for table names. It could look something like this

db-to-sqlite "postgresql://localhost/myblog" blog.db \
    --table-name-pattern "tag_\w+"

[manojlds]

Good option to have!