Provide embed helpers

[EddieTheCubeHead]

The library should provide an interface for checking the validity of embeds.

• [ ] Should be able to check embed validity one property at a time
• [ ] Should be able to create a model to validate an embed against.
• [ ] The model should have the following configuration options for every field
  • Anything goes
  • Match regex
  • Match text
  • Should be None
• [ ] Should be able to create bases with either all should be none, or all are anything goes with methods
• [ ] Should be able to construct embed validation models easily based on the bases mentioned above