fix setting endian before creating request will create invalid request

[aldas]

• fix setting endian before creating request will create invalid request
• add ability to set delay between sending the request and receiving request (helps with serial devices)
• add support for serial devices in examples/index.php

[codecov]

Codecov Report

Patch coverage: 96.96% and project coverage change: -0.04 ⚠️

Comparison is base (09bd467) 98.72% compared to head (fb0332c) 98.69%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #144      +/-   ##
============================================
- Coverage     98.72%   98.69%   -0.04%     
- Complexity      887      892       +5     
============================================
  Files            69       69              
  Lines          2277     2291      +14     
============================================
+ Hits           2248     2261      +13     
- Misses           29       30       +1     

Flag	Coverage Δ
unittests	98.69% <96.96%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
src/Network/SerialStreamCreator.php	93.75% <ø> (ø)
src/Network/BinaryStreamConnection.php	96.29% <75.00%> (-1.71%)	⬇️
src/Network/BinaryStreamConnectionBuilder.php	100.00% <100.00%> (ø)
src/Network/BinaryStreamConnectionProperties.php	100.00% <100.00%> (ø)
...Packet/ModbusFunction/MaskWriteRegisterRequest.php	100.00% <100.00%> (ø)
...acket/ModbusFunction/MaskWriteRegisterResponse.php	100.00% <100.00%> (ø)
src/Packet/ModbusFunction/ReadCoilsRequest.php	100.00% <100.00%> (ø)
...ket/ModbusFunction/ReadHoldingRegistersRequest.php	100.00% <100.00%> (ø)
...acket/ModbusFunction/ReadInputDiscretesRequest.php	100.00% <100.00%> (ø)
...acket/ModbusFunction/ReadInputRegistersRequest.php	100.00% <100.00%> (ø)
... and 8 more

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