refactor(collections): improve implementation signatures

[iuioiua]

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This PR simplifies the implementation signatures of some functions within std/collections.

Previously, selector parameters were written in a manner that was a little more complicated than needed, also resulting in having to rely on ReturnType<typeof selector> within function bodies. The return type of selector parameters are now defined within a second type argument, S.

This change is non-breaking as it adds a new type argument. The aim of this change is to make implementation signatures of these functions easier to understand, and hopefully avoid the need for overload signatures for these functions.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.36%. Comparing base (1cfd39c) to head (5cfcb96).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4666   +/-   ##
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  Coverage   91.36%   91.36%           
=======================================
  Files         477      477           
  Lines       37334    37331    -3     
  Branches     5325     5325           
=======================================
- Hits        34109    34107    -2     
  Misses       3164     3164           
+ Partials       61       60    -1     

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