Add option to specify command timeout

[d21d3q]

I've been working with DP-EH400/1 printer, and I observed response times above 50ms, sometimes reaching 80ms. This PR allows for specifying custom timeout value.

[sourcery-ai[bot]]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.21%.

Quality metrics	Before	After	Change
Complexity	5.02 ⭐	5.01 ⭐	-0.01 👍
Method Length	50.20 ⭐	50.44 ⭐	0.24 👎
Working memory	6.75 🙂	6.82 🙂	0.07 👎
Quality	75.92% ⭐	75.71% ⭐	-0.21% 👎

Other metrics	Before	After	Change
Lines	681	682	1

Changed files	Quality Before	Quality After	Quality Change
tests/test_methods.py	73.97% 🙂	73.96% 🙂	-0.01% 👎
thermalprinter/init.py	87.84% ⭐	87.84% ⭐	0.00%
thermalprinter/thermalprinter.py	75.80% ⭐	75.58% ⭐	-0.22% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
thermalprinter/thermalprinter.py	ThermalPrinter.image	22 😞	197 😞	14 😞	32.74% 😞	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
tests/test_methods.py	test_signature	0 ⭐	391 ⛔	6 ⭐	60.26% 🙂	Try splitting into smaller methods
thermalprinter/thermalprinter.py	ThermalPrinter.__repr__	8 ⭐	102 🙂	10 😞	60.88% 🙂	Extract out complex expressions
thermalprinter/thermalprinter.py	ThermalPrinter.__init__	3 ⭐	136 😞	10 😞	61.47% 🙂	Try splitting into smaller methods. Extract out complex expressions

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• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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[BoboTiG]

Thanks @d21d3q !

I'll update the project, and do a new release when I'll have some free time.