Increase BitArray indexing size

[jzakiya]

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Feature Request

• Is your feature request related to a problem? Please describe clearly and concisely what is it.
• Describe the feature you would like, optionally illustrated by examples, and how it will solve the above problem.
• Describe considered alternative solutions, and the reasons why you have not proposed them as a solution here.
• Does it break backward compatibility, if yes then what's the migration path?

In case this proposal includes a substantial change to the language, we ask you to go through an RFC process.

The best place to start an open discussion about potential changes is the Crystal forum.