refactor: Replace Slim Framework by Framework X

[tienvx]

Try to fix these issues:

• Random fail (timeout) on provider example (mostly Windows) #672
• Compatibility Suite: Random fail on 'V3 era Generators applied to HTTP parts' feature #641
• Compatibility Suite: Random fail on 'V3 era Generators' feature #549

Slim Framework + PHP Built-in web server -> slow

The web server runs only one single-threaded process, so PHP applications will stall if a request is blocked.

Framework X + ReactPHP -> faster 2x -> 4x

Supports async and non-blocking execution for maximum performance

Another option is AMPHP, but it's a bit slower, and the syntax is not similar to Slim Framework than Framework X

[coveralls]

Pull Request Test Coverage Report for Build 11120311314

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.884%

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Totals
Change from base Build 11118184962:	0.0%
Covered Lines:	2586
Relevant Lines:	2697

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💛 - Coveralls

[tienvx]

Tested with:

• Re-run compatibility suite v3 10 times
• Re-run examples on Windows 10 times
• Re-run examples on MacOS 13 5 times
• Re-run examples on MacOS 14 5 times

[tienvx]

Indirectly related to #260