Add internal `utils` folder to FCL

[JeffreyDoyle]

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Overview

Lots of small utility functions exist throughout FCL is, etc . We should consolidate these utils into a single internal utils folder in FCL. These utils should be internal and not exported.

Expected Outcomes

• [ ] Consolidated ./utils folder exists inside FCL.
  • [ ] Includes all utils (is, etc) that are used throughout FCL

[VedanthB]

Id like to take this up

[justinbarry]

@VedanthB We would love it if you filed a PR!