feat: Add support for covers class method annotation

[dshafik]

What:

• Bug Fix
• New Feature

Description:

Adds support for the CoversMethod annotation. As a bonus it fixes these two ignored uncovered types:

  src/PendingCalls/TestCall.php ...... pa521, pa521 100%

Usage

For single class method alone:

covers([ClassName::class, 'method']);
// or
covers([
     [ClassName::class, 'method']
]);

For multiple values:

covers(ClassName::class, [OtherClassName::class, 'method']);
// or
covers([
    ClassName::class, 
    [OtherClassName::class, 'method']
]);

Related:

[dshafik]

@nunomaduro made some updates to ensure that both array and variadic args are supported correctly, there are tests for all variants