Allow `end()` at expected structures

[KES777]

My tests looks like:

$data =  eval read_data 'many-countries-refresh';
is $got, $data, "Refresh data after create";

@@ many-countries-refresh
{
	Country => [
		{ id => D(),  name => "XCom" },
		{ id => D(),  name => "XY"   },
		{ id => D(),  name => "Zero" },
		end(),
	],
}

This would be very handy to have this: no need manually create array { } structures.

Actual: got the error No current build! at
Expected: the check should be completed successfully if there is only 3 items at the array.

[exodist]

A few thoughts:

1. end() is assumed when you use is() any array you give it, it will verify it only contains the provided elements. You can use like() if you want the opposite behavior where etc() is assumed.

2. It should be trivial to write a tool that turns an array into the correct array { ... } structure. In fact, Test2 already does that under the hood, with different defaults for is() vs like(). See https://metacpan.org/dist/Test-Simple/source/lib/Test2/Compare.pm#L64

The main thing to be concerned about is how to handle nested arrays. The link above takes you to the current tools that turn plain arrays into checks, and they treat all levels of nesting the same.

[KES777]

Thanks for feedback.

I need more tests to write for my program, so I will be able better feel/understand how it works/how to improve it.