Avoid long chain of unnecessary dependencies

Please copy&paste [these 16 lines](https://github.com/jamestalmage/lazy-singleton/blob/69436f1374e3caab42049f18f55f3754bef8a18e/index.js#L4-L20) that are actually used from the `lazy-singleton` dependency to this module to avoid absolutely unnecessary dependency on p2n <– global <– min-document <– dom-walk…


min-document has 54 kiB, dom-walk 18.2 kiB

Start with the repository entry point and compare its use of the lazy-singleton dependency with the linked 16 lines from lazy-singleton's index.js. Confirm the dependency chain is no longer needed and run the existing tests to verify lazy-loading behavior is unchanged.

Written by the indexing model from the issue text.