Dynamic Workers Scaling via RPC

[butschster]

see #1728

Q	A
Bugfix?	❌
Breaks BC?	❌
New feature?	✔️
Issues	roadrunner-server/roadrunner#1728

With this new feature, developers can now scale their RoadRunner workers dynamically via RPC. We've added a Spiral\RoadRunner\WorkerPool class that provides an easy interface to add or remove workers from the RoadRunner worker pool, specifically for plugins that run in a worker mode.

Usage

Here's a quick example of how to use the new feature:

use Spiral\RoadRunner\WorkerPool;
use Spiral\Goridge\RPC\RPC;

$rpc = RPC::create('tcp://127.0.0.1:6001');
$pool = new WorkerPool($rpc);

// Add worker to the pool.
$pool->addWorker('http');

// Remove worker from the pool.
$pool->removeWorker('http');

This provides developers more control and flexibility over their RoadRunner setup, allowing for better resource allocation based on the needs of their application.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (5c22fab) 29.85% compared to head (23e2811) 48.37%.

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Additional details and impacted files

@@              Coverage Diff              @@
##                3.x      #31       +/-   ##
=============================================
+ Coverage     29.85%   48.37%   +18.51%     
- Complexity       91       94        +3     
=============================================
  Files             9        9               
  Lines           211      215        +4     
=============================================
+ Hits             63      104       +41     
+ Misses          148      111       -37     

Files	Coverage Δ
src/WorkerPool.php	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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