feat(plc4py/simulated): add in-process simulated PLC driver

[Abdylreshit]

Summary

Adds a new `simulated` driver to `plc4py`, matching the existing Java (`plc4j/drivers/simulated`) and Go (`plc4go/internal/simulated`) implementations. The mspec-generated protocol code under `plc4py/protocols/simulated/readwrite/` was already in the tree, but no Python driver consumed it; this PR fills that gap.

The driver runs entirely in-process — it does not open a network socket and does not need an external PLC or simulator — so it is useful both as a reference implementation of the `plc4py` driver SPI and in tests that need a working driver without infrastructure.

Tag semantics

Tag format: `TYPE/name:DATA_TYPE[count]` (same as the Java and Go drivers).

Tag type	Read	Write
STATE	Returns the last written value, or `NOT_FOUND` if never written	Stores the value in memory
RANDOM	Returns a freshly generated random value for the data type	`ACCESS_DENIED`
STDOUT	`ACCESS_DENIED`	Logs the value

All 19 data types from `simulated.mspec` are supported (`BOOL`, `BYTE`, `WORD`, `DWORD`, `LWORD`, `SINT`, `INT`, `DINT`, `LINT`, `USINT`, `UINT`, `UDINT`, `ULINT`, `REAL`, `LREAL`, `CHAR`, `WCHAR`, `STRING`, `WSTRING`), both scalar and arrays.

Files added

• `plc4py/drivers/simulated/SimulatedTag.py` — tag parser (regex, enum, builder)
• `plc4py/drivers/simulated/SimulatedConfiguration.py` — URL config
• `plc4py/drivers/simulated/SimulatedDevice.py` — in-memory state store + random-value generator
• `plc4py/drivers/simulated/SimulatedConnection.py` — connection, driver and pluggy loader
• `plc4py/tests/unit/plc4py/drivers/simulated/` — 20 unit tests (tag-parser unit tests + end-to-end via `PlcDriverManager`)

Also registers the new driver via `pyproject.toml` entry points:
```toml
simulated = "plc4py.drivers.simulated.SimulatedConnection:SimulatedDriverLoader"
```

Test plan

• `pytest tests/unit/plc4py/drivers/simulated/ -v` — 20 passed
• `pytest` full suite — 97 passed, 36 xfailed (was 77 passed, 36 xfailed before; no regressions)
• Tag parser handles STATE / RANDOM / STDOUT prefixes, arrays, dotted names, unknown types
• `STATE` write → read round-trips preserve the value (scalar and array)
• `RANDOM` reads return correctly-typed `PlcValue` instances; writes return `ACCESS_DENIED`
• `STDOUT` writes succeed and are logged; reads return `ACCESS_DENIED`
• Multi-tag read request dispatches each tag independently