Fix pollution of includedUnits defaults

[y-exp]

With the 4.0.0 release of enhanced-ms, passing includeMs: true to the format method causes subsequent calls to always include milliseconds in the resulting string, even when includeMs: false is specified:

import { ms } from 'enhanced-ms';

console.log(ms(1001, { includeMs: false }));
// -> 1 second ✅
console.log(ms(1001, { includeMs: true }));
// -> 1 second 1 millisecond ✅
console.log(ms(1001, { includeMs: false }));
// -> 1 second 1 millisecond ❌

The same issue occurs with includeSubMs: true for microseconds and nanoseconds.

The bug stems from the resolveFormatOptions method, which modifies the original defaultFormatOptions.includedUnits array here:

https://github.com/apteryxxyz/enhanced-ms/blob/f119aff3969e72524a74139c3efca7081ab91597/src/format/helpers/resolve-options.ts#L133-L134

This PR fixes it by simply creating a copy of said array.

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[k0d13]

Can you add a changeset