BREAKING(assert,testing): remove formatter option from assertEquals()

[iuioiua]

What's changed

This change removes the option argument from assertEquals(). The only option within this argument was formatter, which allowed the user to format the actual and expected strings before being internally processed for display after they were determined to not be equal.

Why has this change been made

This argument was removed because it didn't seem to have many use cases outside of some code previously internal to the Standard Library. The function's built-in formatter performs its job fine.

Migration guide

To migrate, simply remove the options argument from assertEquals():

  import { assertEquals } from "@std/assert/assert-equals";

- assertEquals("hello", "world", {
-   formatter(text) => myCustomFormatter(text),
- });
+ assertEquals("hello", "world");

[kt3k]

I think #4930 unblocks this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.12%. Comparing base (44bc900) to head (a8ad248).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4893      +/-   ##
==========================================
- Coverage   92.12%   92.12%   -0.01%     
==========================================
  Files         487      487              
  Lines       38763    38761       -2     
  Branches     5388     5388              
==========================================
- Hits        35710    35708       -2     
  Misses       2997     2997              
  Partials       56       56              

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[kt3k]

LGTM