Add lightweight PSR-3 implementation

[roxblnfk]

Description

Add a standalone PSR-3 implementation that works with Trap and is compatible with both fiber-based asynchronous code and synchronous execution.

Requirements

• Implementation must be self-contained without dependencies from other packages or project parts
• Must be for client-side of the project only
• Must function in both async code with fibers and synchronous code
  • To detect async execution just check that \Fiber::getCurrent() is not null
  • Non-blocking mode in async case.
• Should attempt to send logs to Trap server using Monolog format first
• Fall back to STDERR in text format if connection fails
• Logger should be accessible via trap()::logger()

Implementation Notes

The logger needs to handle both execution contexts appropriately and prioritize Trap server logging with graceful fallback to STDERR.

[olegmifle]

Hi!
I can take on the issue. The deadline is roughly mid-July.

[roxblnfk]

@olegmifle hi, any updates there?

[olegmifle]

@roxblnfk hello. I need little more time