Specify button renderer callable type

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	comma-separated list of tickets # fixed by the PR, if any

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3495a4b) 92.16% compared to head (1547cea) 92.16%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #143   +/-   ##
=========================================
  Coverage     92.16%   92.16%           
  Complexity      460      460           
=========================================
  Files            29       29           
  Lines          1620     1620           
=========================================
  Hits           1493     1493           
  Misses          127      127           

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[what-the-diff]

PR Summary

• Added new type definition to two classes
  This update brings a new type definition called ButtonRenderer. This has been added to both ActionColumn and ActionColumnRenderer classes.

• Removed unused statement from a class
  In a housekeeping move, an unused use Closure statement has been removed from the ActionColumnRenderer class. This doesn't make any noticeable changes but helps keep our code clean.

• Retyped a property
  The defaultButtons property had its type updated from an array of closures (special type of function) to an array of the new ButtonRenderer.

• Updated Construction method in a class
  The __construct method of ActionColumnRenderer class held an update to accept null for the defaultButtons parameter. Providing null now won't cause any issues when creating objects of this class, increasing flexibility in use.

• Functionality modification in the class
  The anonymous function within the ActionColumnRenderer class has been enhanced to return the result of $buttons[$name]($url) as a string. This small change guarantees that this function will always produce a string output. This consistency can simplify future development work.