chore: move dev-only dependencies to devDependencies

[sodabrew]

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

Accepted.

Fixes

This package does not have a runtime dependency on chai or esdocs. These are devDependencies. The two negative effects of having these listed as runtime dependencies are larger bundle / node_modules size at runtime and that downstream applications get flagged by Dependabot and other tools for having vulnerable and outdated dependencies.

See PR #53 for the original addition of these deps.

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

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