feat: add permutator that can permutate over the number type

[janechu]

Description

This kicks off the work to add the permutator, a utility written to provide permutations over JSON schema. This is the initial setup and iteration over the number type. Future additions include the types string, null, boolean, array, object and integer.

Issue type checklist

• Chore: A change that does not impact distributed packages.
• Bug fix: A change that fixes an issue, link to the issue above.
• New feature: A change that adds functionality.

Is this a breaking change?

• This change causes current functionality to break.

Adding or modifying component(s) in @microsoft/fast-components checklist

• I have added a new component
• I have modified an existing component
• I have updated the definition file
• I have updated the configuration file

Process & policy checklist

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

[nicholasrice]

I'm approved with the caveat that I don't know C.

[EisenbergEffect]

The primary thing I'd like to see before merging is a bit more documentation. Two forms I'm thinking of: some code docs for each function and struct; some basic readme type info with build instructions and a high level explanation of the design/purpose.

[janechu]

@EisenbergEffect I've already added build instructions in this projects CONTRIBUTING.md file, but I've added the other comments and more context to the README.md.