Adds Arrays::implode

[frankdekker]

Adds Arrays::implode to implode an array like normal, but with support for iterables and allows BackedEnum as value.

Example:

implode(BackedEnum::cases(), ':');

[Copilot]

Pull request overview

Adds a new Arrays::implode() utility to join values into a string with support for iterable inputs and BackedEnum values, plus accompanying unit tests and documentation updates.

Changes:

• Added Arrays::implode(iterable $items, string $separator = ','): string with BackedEnum handling.
• Extended ArraysTest to cover basic implode cases (scalars, Stringable, enums).
• Updated README to document the new implode helper and added a mock backed enum for tests.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
src/Arrays.php	Introduces Arrays::implode() and related imports/PHPDoc.
tests/Unit/ArraysTest.php	Adds a new testImplode() covering several value types.
tests/Mock/MockStringBackedEnum.php	Adds a string backed enum fixture used by tests.
README.md	Documents the new implode helper in the Arrays section.

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