fix: rename Array.prototype.group/groupToMap

[dnalborczyk]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

https://github.com/tc39/proposal-array-grouping#why-group-and-not-groupby

tc39/proposal-array-grouping#37

Description

[codecov]

Codecov Report

Merging #4531 (5c29880) into master (1792cdf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4531   +/-   ##
=======================================
  Coverage   98.89%   98.89%           
=======================================
  Files         208      208           
  Lines        7332     7332           
  Branches     2094     2094           
=======================================
  Hits         7251     7251           
  Misses         26       26           
  Partials       55       55           

Impacted Files	Coverage Δ
src/ast/nodes/shared/ArrayPrototype.ts	100.00% <ø> (ø)

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