Add a few more built-in converters

[Emily-Jiang]

Description

As a:

• Application user/user of the configuration itself
• API user (application developer)
• SPI user (container or runtime developer)
• Specification implementer

...I need to be able to:

automatically convert a string to UUID, Charset

...which enables me to:

UUID u = ConfigProvider.getConfig().getValue("uuid", UUID.class);
Charset u = ConfigProvider.getConfig().getValue("charSet", CharSet.class);
Pattern p = ConfigProvider.getConfig().getValue("pattern", Pattern.class);