Add case-sensitive KV support

[zerowidth]

This PR is a continuation of the bugfix in #53:

• Adds --table-name to the migration generator and config (for easier use, and for use in tests)
• Adds --case-sensitive to the migration generator to update the KV table to use the case-sensitive utf8_bin collation for the key column and table.
• Adds config support for config.case_sensitive = true to enable case-sensitive behavior in the KV library.