Modernize code

[sukhwinder33445]

Add PHP 8.2+ type declarations across codebase

This PR adds comprehensive type declarations to the entire codebase, enabling modern PHP type system features and improving static analysis capabilities. It also modernizes the codebase to require PHP 8.2 or later.

Changes

Type System Improvements

• Parameter type declarations: Added type hints to all method parameters matching PHPDoc annotations
• Return type declarations: Added return types to all methods for better type safety
• Property type declarations: Added typed properties throughout the codebase
• Simplified union types: Replaced overly specific PHPDoc union types with mixed where appropriate (e.g., array<mixed>|bool|float|int|string → mixed)

Code Refactoring

• Converted legacy switch/case statements to modern match expressions in Filter::performMatch()
• Removed redundant runtime type validation that is now enforced by the type system
• Replaced self return type with static for better fluent interface support
• Updated nullable property declarations with proper initialization

Interface Updates

• Added type declarations to all contract interfaces (Filterable, Paginatable, PluginLoader, Translator)
• Standardized return types across interface implementations
• Added ?string type hints for optional context parameters

Minimum Version Requirement

• Updated composer.json to require PHP 8.2 or later
• This enables use of typed properties, match expressions, and union types

Breaking Changes

Requires PHP 8.2+ - Projects using PHP 7.x will need to upgrade

The following classes and interfaces have not been modernized because they have dependencies

• ipl\Stdlib\Contract\Validator
  (to many overrides)
• ipl\Stdli\Events::on($event, callable $listener): static
  (parameter $event stays without type to match the definition of the interface Evenement\EventEmitterInterface)
• ipl\Stdlib\Messages::getMessage()
  (without return type to match the definition of the interface ipl\Stdlib\Contract\Validator)

[BastianLedererIcinga]

The return type of BaseFilter::setBaseFilter can be changed to static.

The base branch was changed.

[sukhwinder33445]

Please rebase.

[sukhwinder33445]

ipl\Stdlib\Messages::getMessage()
(without return type to match the definition of the interface ipl\Stdlib\Contract\Validator)

I assume you mean the getMessages() method. However, it already declares a return type in both the mentioned trait and the interface. Since both are part of ipl-stdlib, the return type can be added there.

[sukhwinder33445]

Everything else looks good to me.

[sukhwinder33445]

ipl\Stdlib\Messages::getMessage()
(without return type to match the definition of the interface ipl\Stdlib\Contract\Validator)

I assume you mean the getMessages() method. However, it already declares a return type in both the mentioned trait and the interface. Since both are part of ipl-stdlib, the return type can be added there.

Please ignore, we cannot add a return type to getMessages() as it would require changes in the imedge module, which we do not maintain.

[sukhwinder33445]

Looks good to me.