fix(collection)!: default sort comparison algorithm

[Renegade334]

Please describe the changes this PR makes and why it should be merged:

The documentation for Collection#sort and Collection#toSorted implies that if no comparison function is passed to the method, the default comparison behaviour mirrors that of Array.prototype.sort – in other words, stringwise comparison by UTF-16 code points.

As things stand, that's not the case. There are a couple of significant issues with the current implementation of defaultSort:

• The function doesn't implement stringwise comparison but instead just uses the > operator, which preferentially performs numeric comparison of its operands.
  • For example, '1.0' is sorted after 1 with stringwise comparison, but '1.0' > 1 is false.
• The function returns -1 (ie. A before B) if A is neither greater than B nor strict-equal to B. However, this isn't logically correct in a sort comparison context, and leads to violations of the required properties of a reliable comparator.
  • For example:

    const a = { a: 1 };
    const b = { b: 2 };
    defaultSort(a, b); // -1
    defaultSort(b, a); // also -1
    

I'm assuming that the intention is for the default behaviour to mirror that of Array.prototype.sort, and so this PR rewrites the function to follow the ECMA-262 specification for the default comparison algorithm. The docblocks are also updated to reflect this more accurately.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating