DRILL-8271: Make Storage and Format Config Case Insensitive

[cgivre]

DRILL-8271: Make Storage and Format Config Case Insensitive

Description

Allows format and storage configs to be case insensitive.

Documentation

N/A

Testing

Ran existing unit tests.

[cgivre]

@cgivre Hi. Some configurations require case-sensitive keys to be passed to a plugin, such as JDBC's properties. Will this change be compatible?

I believe so. If this is in an inner map, this change won't matter.